Here is the full list of all 21 East Tower - there are Akio achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
You've unlocked all of the Achievements!
You've unlocked the Normal Ending!
You've unlocked all of the CGs!
You've unlocked the Love Ending!
You've cleared Stage 7 and done an excellent job!
You've cleared the Love Stage!
You've cleared Stage 6 and done a good job!
You've cleared Stage 6 and done an excellent job!
You've transformed him into a carrot!
You've cleared Stage 5 and done a good job!
You've cleared Stage 5 and done an excellent job!
You've cleared Stage 4 and done a good job!
You've cleared Stage 4 and done an excellent job!
You found out why he turned into a kid.
You've cleared Stage 3 and done an excellent job!
You've cleared Stage 2 and done a good job!
You've cleared Stage 2 and done an excellent job!
You've cleared Stage 1 and done a good job!
You've cleared Stage 1 and done an excellent job!
You've unlocked the Bad Ending!
You've cleared the Prologue!