Here is the full list of all 30 East Tower - there are Kuon 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 got the Love Ending!
You've cleared the Love Stage with Kuon!
You've cleared the Love Stage with adult Kuon!
You've cleared Re-Stage 4 and done a excellent job!
You've cleared Re-Stage 2 and done a excellent job!
You've cleared Re-Stage 3 and done a excellent job!
You've cleared Re-Stage 1 and done a excellent job!
You've got the Normal Ending!
You've cleared Stage 7 and done an excellent job!
You've got the Bad Ending!
You've cleared Stage 6 and done a excellent job!
You've cleared Re-Stage 5 and done a excellent job!
You've cleared Re-Stage 4 and done a good job!
You've cleared Re-Stage 3 and done a good job!
I remembered all what I've experienced with him.
You've cleared Re-Stage 2 and done a good job!
Meet the Great Octopus and fulfill her wish!
You've cleared Re-Stage 1 and done a good job!
You've cleared the Re-Prologue!
And now we returned back to the beginning of the game...
You've cleared Stage 2 and done a good job!
You've cleared Stage 1 and done a good job!
You've failed to clear Stage 5, but...?
You've cleared Stage 4 and done an excellent job!
You've cleared Stage 3 and done an excellent job!
You've cleared Stage 2 and done a excellent job!
You've cleared Stage 1 and done an excellent job!
You've cleared the Prologue!