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