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 all of the CGs!
You've unlocked the Love Ending!
You've cleared the Love Stage!
You've cleared Stage 6 and done an excellent job!
You've transformed him into a carrot!
You've cleared Stage 5 and done an excellent job!
You've cleared Stage 4 and done a good job!
You've cleared Stage 2 and done an excellent job!
You've cleared Stage 1 and done an excellent job!
You've unlocked the Normal Ending!
You've cleared Stage 7 and done an excellent job!
You've cleared Stage 6 and done a good job!
You've cleared Stage 5 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 unlocked the Bad Ending!
You've cleared Stage 1 and done a good job!
You've cleared the Prologue!