Here is the full list of all 12 Krakout challenge achievements.
Complete ten levels in arcade game mode.
Complete 50 levels in arcade game mode.
Complete 100 levels in arcade game mode.
Complete all 'Nostalgia', 'Time travel', and 'New age' levels at a single game.
Complete ten levels in challenge game mode.
Complete 50 levels in challenge game mode.
Complete 100 levels in challenge game mode.
You make ten levels in a game.
You share ten levels in a game.
Completed all 'Nostalgy' levels.
Completed all 'Time travel' levels.
Completed all 'New age' levels.