Trophy Guide:
真の勇者 
勇者ネプテューヌを遊び尽くした証。君がだ！
[True Hero]
[You're the one who completely played out Super Neptunia RPG!]
nasu wo Tabeta 
ナスを食べた
[nasu wo Tabeta]
[Ate the eggplant]
MISSABLE
This trophy can be obtained by seeing an event where Neptune eats an eggplant. Despite seeming simple enough, this is the most easily missable trophy in the game and it can only be done halfway through the game, so missing it can be quite frustrating.
To begin with, the chain of events to get the trophy can only be triggered once you have unlocked the Companion House, which is also where you can get the fifth dictionary towards It wasn't necessary?. The event will be locked off once you talk to Chrome here. If you talk to her before getting this event by accident, make sure to select the second option to get out of the conversation.
As far as starting the string of events, you will first want to go to the resistance base in Yasunaya Forest. While you cannot warp to the base yet at this point, you can warp to the deepest save point within the forest so that you only have to go one screen to the left to access the base. Once you reach the base, you will need to go into the room on the right where Artisan will be waiting to speak to you, triggering an event.
After you have seen this event, you will have to go to Mount Futago and see three different events in which an eggplant is collected. These events must be seen in order and the locations of them can be seen in these screenshots
Event 1
Event 2
Event 3
Once you have seen these three events, you must go back to Artisan where you saw her before to trigger another event.
Finally, you must go to the screen to the left of the entrance to the Companion House in Sakura Road. This can be done by warping to the house, exiting the safe zone, and then going one screen to the left. Once you have went to the screen to the left and walked a little further to the left, the final event will trigger and you will obtain this trophy after it ends.
おっぱい勇者
みんなで温泉に行った
[Boob Hero]
[Went with everyone to the hotsprings]
For this trophy, you must see the hotsprings event. You can access this by going into the Companion House after beating the game. This is incredibly easy as the game dumps you right outside of the house after the credits, so you can just go in to access the event right away. Once you have either read through the event or skipped to the end of it, this trophy will unlock.
勇者パーティーの団結力
たくさんChainが繋がった
[The unity power of the Hero]
[Connected lots of chains]
For this trophy, you must get a large chain. While the game does not specify how long the chain must be, the trophy can be obtained easily by just firing off Chrome's Break Attack, which will do over 50 hits on its own. Once you have finished the battle after reaching the needed chain, the trophy will unlock.
ネプテューヌガチ勢 
ネプテューヌのレベルが100に到達した
[Neptune is a Chi Force]
[Neptune accomplished level 100]
For this trophy, you must reach Level 100 with Neptune. Normally, this would be a rather boring process as there is not much to do in post-game and the amount of experience you get per encounter can get quite middling as you level up more and more and the enemies simply cannot keep up anymore to give you proper experience. That said, there is a room in the Inside Histoire dungeon that has 14 groups of metal dogoos that can be used to make this grind go by much more quickly.
First of all, to access this dungeon outside of the story, you will need to make it far into the game until Chrome is back at the Companion House following the first visit to the dungeon so that you can speak to her to access it again. As far as in-story occurrences, you will see the dungeon for the first time after getting everyone's goddess forms and exploring Yanderera Castle once again. You will only be able to attack one wave of the enemies here though, so this is mostly good just for powerleveling to make the upcoming battles easier before you can unlock the dungeon permanently.
As far as finding the room, the path to it is within the final room of the dungeon. You will know when you are at the final room as the room right before it has the dungeon's only save point before the door to this room. Once you have entered the final room, if you look to your left, you will notice that there is a tiny block floating in the air that can be used as a platform to get farther to the left to access a chest. Instead of going for this chest, however (or after getting it), you will want to jump down the gap here. Instead of taking you back to the beginning of the dungeon, the game will drop you into a room littered with enemy encounters, all of which are metal dogoo groups.
Since the metal dogoos can only be killed consistently with normal rocks and stones, you will want to make sure that you have a healthy stock of light grey stones before grinding here so you can throw them at the dogoo groups to take them all out at once. These can be gotten from Leanbox's item store for 800 credits a piece. When you are starting out, each group should only take 2 stones to go down, though as you progress and the dogoos get stronger, you will find yourself taking 3-4 stones per group when they get 80 HP and 5 stones per group when they get 120 HP. As such, it is best to get as many stones as you can afford (up to 99 can be held at once) to make sure that you can get the most out of your trips. Once you really get going, the money spent on this will be a drop in the bucket anyway, so finances should not pose much of an issue.
During one trip, you can only kill the dogoos once, but by going outside of Planeptune and then coming back to the Companion House before reentering the dungeon, you can respawn the metal dogoos so that you can face them again. As you will be going to Leanbox between trips to restock on stones to throw at the dogoos, this should be a non-issue.
By doing this, it should not take you more than half a dozen or so trips to reach Level 100, especially since the dogoos get stronger and, in the process, give more EXP and credits as you go along, giving 35k per dogoo once you reach around Level 90.
Also, if you still have battles left to do in the game overall when you get this, you should consider grinding up to around Level 110. It will not take much longer and you will get a ridiculously insane amount of health per level, capping at around 8000 extra HP per level before you go back down to a still ridiculous, but relatively pointless, 2000 HP per level from Level 111 onwards. This will make the rest of the game an absolute cakewalk as nothing should be capable of killing you at this point short of you getting the Erosion debuff and not healing it before it kills you.
ネプテューヌ無双
敵を300体倒した
[Unparalleled Neptune]
[Defeated 300 enemies]
This trophy will come naturally just from going through the game since you should be killing enemies as you go to keep up with the level curve. Even if you're trying to avoid a lot of enemies, you will almost certainly get this by the end of the game, if not a lot sooner.
トレジャーハンター
たくさん宝箱を開けた
[Treasure Hunter]
[Opened lots of treasure chests]
While the exact number of chests you must open is unknown, the amount that needs to be opened is far lower than how many chests are actually in the game. So long as you're making sure to get every chest you can find, which you should be doing anyway for the items and money that they contain, you should get this at some point while exploring Leanbox or while freeing Noire from the Yanderera Castle. Even if you've been actively ignoring chests for whatever reason, cleaning this up should not take long at all, especially once you get the double jump ability.
大富豪ネプテューヌ
所持金が500,000Creditを越えた
[Millionaire Neptune]
[Possessed more than 500,000 credits]
To get this trophy, you must have 500,000 credits on you at once. In spite of this, it is not worthwhile to save coins through the game towards this trophy as you will get plenty of credits while grinding to Level 100 as described under Neptune is a Chi Force, and the expenses of this grind will be far eclipsed by the amount of money that you make per run. There is a good chance that you may even end up with over double the amount needed for the trophy by the end of the grind so you can even truly be a millionaire like the trophy name implies.
賞金稼ぎ
15種類のハントクエストをクリアした
[Bounty Hunting]
[Cleared 15 different hunt quests]
For this trophy, you must clear 15 different hunt quests. As the quests unlock in batches, you will have to do quests 0-14 for this as Quest 15 will not unlock until Quest 14 is cleared. You will likely be going for this in the post-game as even if you work on this as you go along, Quest 11's boss will be stuck behind a story barrier that cannot be crossed until the end of the game, so while you can certainly work up to that point to get that boss and the game's ending done in one trip, you will still have to do the last three quests as well for the trophy.
As for the quests themselves, many of the bosses are not that hard, and if you go for them after grinding to Level 100, they should all be a cinch. The only quests to watch out for are Quest 10 and Quest 11.
Quest 10's boss is capable of casting Erosion on your team very early into the battle, and if you do not heal the team fast enough, they will all die at once and you will get a Game Over. Your chances of killing the boss before the erosion takes effect are slim, so it is worthwhile to bring at least a couple of group panaceas to deal with the status effect sooner rather than later.
Quest 11's boss has a rather annoying tendency to heal a lot of its health when it goes into critical damage, so rather than simply spamming your best moves on it and letting it die that way, you will want to save up your break gauge until it is full and then, once the boss has taken a fair amount of damage and is closing in on critical status, unleash all four of your break attacks with whatever character's break attack does the most damage to bring it down before it can spam heals on itself. You will absolutely want to be at least at Level 100 before taking on this boss to ensure that you have enough strength to take it down quickly enough this way.
武器コレクター 
武器を30種類手に入れた
[Weapon Collector]
[Collected 30 different weapons]
For this trophy, you must obtain 30 different weapons. It is unlikely that you will get this naturally going through the game, though once you have obtained a massive amount of credits from grinding to Level 100, you can just go from shop to shop and buy any weapons that you do not have until you get this trophy, working your way up from Lastation to Lowee to Leanbox. If you do not want the surplus of weapons from this, you can always save before you start your spending spree and just load the game when you're done.
アクセコレクター
アクセサリーとブレスレットを合計70種類手に入れた
[Accessory Collector]
[Collected the total sum of 70 different accessories and bracelets]
For this trophy, you must obtain 70 different accessories and armors. Though you will get a fair amount of these while playing, it is unlikely that you will get this naturally. Thankfully, you can use the same strategy here as you can for Weapon Collector after obtaining a lot of money to make this easy.
主人公だからね！
ネプテューヌの使用回数が100回を超えた
[Because I'm the protagonist!]
[Used Neptune more than 100 times]
You will get this trophy for using Neptune in over 100 battles. As Neptune is the first character you have access to, never leaves the party, and is one of only five playable characters in a game that lets you have a party of four, there is almost no way to not have this without actively trying to miss it.
富豪ネプテューヌ
所持金が250,000Creditを越えた
[Wealthy Neptune]
[Exceeded 250,000 credits]
See Millionaire Neptune.
スキルエキスパート
スキルを50種類覚えた
[Skill Expert]
[Learned 50 skills]
For this trophy, you must master any 50 skills across all of your characters. In order to master a skill, you must equip some weapon, armor, or accessory that has the wanted skill on it and grind out equipment points until the skill has obtained enough points to be mastered, at which point it can be used without having to have the proper equipment on. Accessories are especially good for this as they give very minimal stat increases and are only good for the skills that they contain and occasionally elemental resistances and weaknesses that they can grant.
Assuming you make sure to switch out accessories whenever you have mastered the skills on them, you should get this before you clear the game between that and whatever skills you master from any weapons you use. If you have any skills in particular that you want to master, especially the skills for resisting and absorbing damage from all elements that you can get in the late game, the metal dogoo room described in Neptune is a Chi Force is great for grinding out EP as the metal dogoos also give those out in spades.
ねぷ子さんは頑張りました。
たくさんクエストをクリアした
[Nepko-san did her best]
[Cleared lots of quests]
For this trophy, you must clear any 30 quests, not counting hunt quests and magic stone switches, which tell you that you've completed a quest upon completion, but do not count for this. The quests that do count for this are the quests that you get from talking to NPCs in dungeons and in safe zones. Upon accepting a quest, you must get all of the required items and/or kill all of the required enemies and then speak to the quest giver again to turn in the quest and get your rewards. Many of these quests involve getting key items that can be found in chests after accepting the quest, though some involve killing enemies for the sake of getting their items or just killing a certain number of enemies, and a select few quests revolve around donating credits or items to the quest giver, which can be done by speaking to the quest giver as soon as the quest is accepted.
Assuming you make sure to accept quests as you go and talk to quest givers as you go through dungeons and safe zones to see if you've done the quest or not, you should get this sometime before beating the game, especially if you can tell what the quests are and can thus focus on them more easily. There are 54 quests in the game, and only two of them are missable, so you should have no issue getting this trophy without having to specifically focus on it.
勇者への道
初めてモンスターを倒した
[The path of the hero]
[Defeated her first monster]
You will get this trophy automatically after defeating your first monster in Lastation as a part of the story.
女神再臨 
女神の力を取り戻した
[Second coming of the goddess]
[Regained the power of the goddess]
You will get this trophy after regaining Neptune's goddess form as a part of the story. As a note, if you have gotten this trophy and still need nasu wo Tabeta or Watch from a brightly lit room, okay?, then you will need another run to get those events as doing this will lock you out of the events needed.
不思議な本
イストワールを入手した
[Mysterious book]
[Obtained Histoire]
For this trophy, you must obtain Histoire. You will get this trophy upon returning to the guild in Lastation after getting Chrome in your party at Ratchet Volcano.
明るい未来へ
懐古の究極竜を倒し、ゲイムギョウ界の未来を守った
[To a bright future]
[Defeated the Nostalgic Ultimate Dragon and protected the future of Gamindustri]
To get this trophy, you must defeat the final boss of the game. As a note, right before taking on this boss and after the two boss battles before it, you will be asked a question upon going up to the boss. Simply select the first answer given (No) to proceed to the boss. Selecting the second answer (Yes) will trap you in a dark void and you will have to reload the game to get out, at which point you will have to, at minimum, do the previous two bosses again, and possibly more depending on when you last saved.
心の友よ
ノワールを助け出した
[Bosom buddy]
[Saved Noire]
You will get this trophy for saving Noire within the Yanderera Castle. To do this, you will first have to defeat the miniboss at the end of the castle, at which point you will open up the ability to access the various cells in the background. In addition to being able to find chests and a magic stone switch here (though you should wait until you have the double jump to make said switch infinitely easier to do), you will also find Noire in one of the cells, and accessing the cell will free Noire and give you the trophy.
女神勇者ネプテューヌ
再び女神として頑張ることにした
[Goddess hero Neptune]
[Once more tried as a goddess]
You will get this trophy after going through the final scenes that play out after defeating the final boss.
最後の仲間
ベールが正式に仲間になった
[Last comrade]
[Vert officially became part of the party]
You will get this trophy after Vert joins the party again after leaving the party. Vert will leave the party shortly after Noire is rescued, though once you go to the resistance base in Yasunaya Forest, she will join again.
はじめての仲間
ノワールとブランが仲間になった
[First comrade]
[Noire and Blanc became part of the party]
You will get this trophy once Noire and Blanc join your party. This will occur after completing Hunt Quest 0 as a part of the story very early on in the game. This hunt quest is located within Ratchet Volcano in the deepest room, which is normally empty.
初代女神
「クロムハート」の姿を目にした
[Founding goddess]
[Saw the figure of "Chrome Heart"]
You will get this trophy after seeing Chrome Heart for the first time. You will get this shortly after escaping from the Inside Histoire dungeon for the first time after a series of events. Beware that there is a set of two bosses directly after these events, so make sure that you're prepared before exiting.
時をかける女神
イストワールを破り、時を戻した
[The goddess who leapt through time]
[Defeated Histoire and reclaimed time]
This trophy will pop after one of the events that occurs after your first fight with Filia in the Bombyx Mori headquarters.
クロムたんハァハァ
「」と叫んだ
[Chrome-tan hya hya]
[Screamed " "]
You will get this trophy en route to the final room of the Bombyx Mori headquarters after an event, so this trophy is unmissable.
タコパ
ーティーを楽しんだ
[Takoparty]
[Enjoyed the takoyaki party]
You will get this trophy after an event in which you have a takoyaki party with most of the cast of the game. You will get this as a part of the story by going to Chrome's house after defeating an octopus boss on a ship towards the end of the game.
夢遊病
ノワールが眠りながら歌い始めた
[Sleepwalking]
[Noire began signing in her sleep]
MISSABLE
For this trophy, you must see Noire's special event. This event can only be seen from when you talk to Chrome in the Lastation guild after recruiting Noire and Blanc to your party to when you explore Nakano Archive and lose Noire temporarily as the event relies on only Neptune, Noire, and Blanc being in the party. To see this event, you must talk to an NPC that shows up between the last two buildings in Lastation's capital town. Once you have gone through the event, the trophy will pop. The NPC can be seen in this image.
Credit goes to 速報最新ニュース for the screenshot
ブラン・オブ・ラウンド
脳内会議を行った
[Blanc of the round]
[Carried out an intracerebral meeting]
For this trophy, you must see Blanc's special event. Unlike the other two character events, this one is story-related and will pop after a series of events that occur after you escape from Yanderera Castle after freeing Noire, with one of these events containing the CG of four Blancs around a round table.
部屋を明るくして離れて見てね
３徹でゲームを楽しんだ
[Watch from a brightly lit room, okay?]
[Enjoyed 3 allnighter gaming sessions]
MISSABLE
For this trophy, you must see Vert's special event. You can see this by approaching the inn within Leanbox's capital city after you have recruited Vert for the final time (you will get Last Comrade when this happens). You should aim to get this event before you initiate the fight against Purple Heart to get your goddess form, though there is a good chance that you will get this naturally anyway as it is a good idea to use the inn to heal yourself and Planeptune has no inn, so if nothing else, you will likely get this partway through exploring Planeptune as long as you go back at some point to restock on supllies and/or use the inn.
必殺技をくらえー！
初めてBreak Attackを目にした
[Take this special technique!]
[Viewed first Break Attack]
For this trophy, you must use a Break Attack. You will first be given a tutorial on this mechanic when fighting a miniboss to gain access to Ratchet Volcano. To use a Break Attack, you must press 
when the yellow gauge on the bottom-right corner of the screen has at least one stock full. After this, the screen will zoom in on your party and you can press the button corresponding to whose attack you would like to use, after which a stock of the gauge will be used up and the attack will be used.
お宝発見！
はじめて宝箱を開けた
[Found treasure!]
[Opened first treasure chest]
See Treasure Hunter.
仲間？
プリンヌを召喚できるようになった
[Comrade?]
[Summoned a Doguddin]
You will get this trophy for summoning a doguddin by pressing 
. You will get this ability at some point while exploring the deepest part of Nakano Archive after you find one of these laying on the ground and see an event. You will be doing this quite a bit to get around and collect chests scattered across the dungeons since jumping on this creature will greatly boost your jump height, so you should get this naturally.
しんでしまうとはなにごとだ
Game Overになった
[What is total death?]
[Got a Game Over]
For this trophy, you just need to get a Game Over by having your entire party die in battle. It is entirely possible to go through the entire game without getting this if you know what you're doing, so if you still need it after everything else, you can just start up a new game and fast forward through the first battle without doing anything until you inevitably die. You could also do this in your first run, though if you've done everything, you will likely have plenty of HP from doing the grind to Level 100 and exponentially more if you did any levels beyond that, so it will take a fair while to die this way.
必要なかった？
辞書を７つ集めた
[It wasn't necessary?]
[Collected 7 dictionaries]
MISSABLE
To get this trophy, you must obtain all seven dictionaries in the game. Five of these can be found in chests, one of them (I) will automatically be gotten s part of the story, and one (VII) is gotten through selecting a certain choice in an event at the Submerged Tower in Planeptune. While the first six dictionaries can be gotten at your own leisure, the seventh dictionary is missable due to only being obtainable in a story event, so you will have to make sure to get the dictionary if you want the trophy. Listed below are the locations of the seven dictionaries.
Dictionary I: You will get this automatically as part of a story event in Nakano Archive.
Dictionary II: This dictionary can be gotten in Leanbox in a house on the left edge of the town. In order to access this house, you will need to either summon a Doguddin on the edge of the gap between the house and the rest of the town to make the jump or use a double jump to get across (or both if you really want to be sure). While it is certainly possible to do this with the Doguddin, it is recommended that you wait until you can double jump to do this as you need to be very precise with the placement of the doguddin to make the jump in one bound.
Dictionary III: This dictionary can be gotten in Lastation after you have unlocked the ability to summon Doguddins. First, you will need to go up to a blue roof along the path where you would access the guild. From here, you should summon a doguddin to jump up to the higher blue roof where you can see a girl with a quest as well as a separate chest. From here, you will want to go to the left so that you can access the roof of another building. From here, you will notice a chest to your left on a faraway building. From the roof that you are on, summon a second doguddin as close to the left edge as possible and jump towards the other roof using the high jump of the doguddin. If you did it right, you can get to the other roof which contains the chest with the third dictionary.
The location of the chest can be seen in this picture.
Dictionary IV: This dictionary can be gotten in a chest in Sakura Road in the top-most central room of the dungeon (one room to the left of the entrance to the Companion House) on a tree branch. While it is possible to get this just using the doguddin summon and your dash, you may want to wait until you unlock the double jump ability in the Planeptune Sea before attempting this since it's so close by. Here is an image of where the chest can be found.
Dictionary V: This dictionary can be gotten in a chest at the Companion House. The chest will be all the way to the left of the house interior and you should have no issue seeing it. If you have been getting the dictionaries as you've gone through, it is possible that this is the last dictionary you will need, so you may unlock the trophy after collecting it.
Dictionary VI: This dictionary is located in Yanderera Castle in the cell where Noire can be rescued as part of the story. As you can access the castle at any point after rescuing Noire and none of the cells will be locked off from you after you leave, this can be gotten at any time. If you need to get this on a revisit, the chest with the dictionary is in the second cell from the entrance, which can be access from the right side of the second main room of the dungeon.
Dictionary VII: (MISSABLE) This dictionary is gotten during an event at the Submerged Tower in Planeptune. After defeating the boss at the end of the dungeon, you can progress through a hole in the wall on the right to reach a computer room. In this room, a series of events will occur and one of the last events will start off by asking you if you want to search the room further (this is the only question in the series of events, so you'll know it when you see it). Simply choose the first option to search the room more and once you've finally returned to Sakura Road and you can control Neptune again, you will see a pop-up telling you that you received the seventh dictionary.
Thanks to H1G and 速報最新ニュース for the locations of the dictionaries as well as the images used.
これが勇者の覇気
鋼スライヌを倒した
[This is the spirit of the Hero]
[Defeated a metal dogoo]
For this trophy, you must defeat a metal dogoo. These enemies can appear in any dungeon as a random encounter and they can absorb all damage except for physical damage, which they merely resist. Even using that, though, they will take little to no damage per attack, and since they run away after a while, they are generally hard to kill. Adding to this, their stats go up as you level up, making it impossible to outpace them, though the EXP and credits they give out also increase to compensate and to ensure that they always give a large payout. There is one method to quickly and easily kill them however, which is to throw normal rocks and stones at them, which will do roughly 25 damage per hit. As the dogoos have low HP, this allows them to be killed very quickly. As long as you have these stones on you (they are light grey; rocks that hit one enemy can be bought from Lastation or Lowee and stones that hit the entire enemy group can be bought from Leanbox), these enemies can make for a good source of quick levels.
In addition, once you unlock Neptune's Nightmare Sword from the equipment shop on Polly Island (this costs 100 magic stones and is highly recommended), you can use Neptune's ultimate physical attack from the sword to do about as much damage to them as you would get from a stone, though due to its 5 AP cost per use and the dogoos' tendency to run away, this method is only practical for groups of one or two dogoos.
