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My Brother Rabbit ~ Trophy Walkthrough
Try to do this all in one sitting. The autosave in this game is AWFUL, unless you're specifically choosing “Quit Game” before closing out.
If you're missing something, look at your required inventory pictures – if there's still one of those items to find on the screen you're on, it will be blue. If not, it will be grey. You might still not be able to get to the item at that point, but at least you'll know what screen they're on.
Nothing is missable - there's chapter select once you finish the game. However, I recommend a few places to quit to the main menu just to trigger the autosave so you can do everything without using chapter select, and I recommend you do the same.