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