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 cleared Stage 1 and done a good job!
You've cleared Stage 1 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 3 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've cleared Stage 5 and done a good job!
You've cleared Stage 5 and done an excellent job!
You've cleared Stage 6 and done a good job!
You've cleared Stage 6 and done an excellent job!
You've cleared the Love Stage!
You've cleared Stage 7 and done an excellent job!
You've unlocked the Love Ending!
You've unlocked the Normal Ending!
You've unlocked all of the CGs!
You've cleared the Prologue!
You've unlocked the Bad Ending!
You've unlocked all of the Achievements!
You've transformed him into a carrot!
You found out why he turned into a kid.