Full list of all 21 Sound of Drop - fall into poison - achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Overlooking things is forbidden
Each of those moments are a part of your journey......
You've started the game
Completed 25% of the Bad Endings
Completed 50% of the Bad Endings
Completed 75% of the Bad Endings
Completed all Bad Endings
You've finally reached the truth of the aquarium
You've finally gained a strong friendship
You have finally returned to happier days
You now understand the poison anyone can possess
You've seen the entire story
You've gathered 25% of the CGs
You've gathered 50% of the CGs
You've gathered 75% of the CGs
You've completed all of the CG scenes!
You've followed the tracks of the mysterious girl
Seek out one of the gems
Try standing still from time to time
Sometimes you feel like you want to throw in the towel
Within the girl is born a strong faith in him