Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
Addicted (100 points)	Play for 5 hours total.
Apprentice (10 points)	Complete a level.
Fan (50 points)	Play for 1 hour total.
Invincible (80 points)	Reach level 45.
Master (80 points)	Score 80.000 points in one game.
Recruit (40 points)	Complete 20 levels.
Rookie (30 points)	Complete a level at HARD difficulty.
Skilled (80 points)	Complete 20 levels at HARD difficulty.
Speed Test (80 points)	Complete a level in under 4 seconds.
Survivor (50 points)	Reach level 20.
The one! (100 points)	Score 5.000.000 points total.
Veteran (100 points)	Complete 100 levels at HARD difficulty.