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