Here is the full list of all 11 Skyscrapers Puzzle: Airis tale achievements.
Reach the bad ending.
Press that button.
Reach the true ending.
Complete all 6x6 campaign levels.
Unlock all the outfits.
If you see this it's already too late.
All hail the king of Ithaca!
I'm not THAT type of game!
Complete all 5x5 campaign levels.
Complete all 4x4 campaign levels.
Play the tutorial.