Complete the following tasks to unlock Apple Game Center achievements, all of which are secret.

Achievement	How to unlock
50 Combos (10 points)	Make 50 combos to reach this achievement.
250 Combos (20 points)	Make 250 combos to reach this achievement.
500 Combos (30 points)	Make 500 combos to reach this achievement.
1000 Combos (50 points)	Make 1000 combos to reach this achievement.
Stage 15 (15 points)	Clear stage 1 through 15 to reach this achievement.
Stage 30 (25 points)	Clear stage 1 through 30 to reach this achievement.
Stage 45 (40 points)	Clear stage 1 through 45 to reach this achievement.
Stage 52 (50 points)	Clear stage 1 through 52 to reach this achievement.
Stage 60 (100 points)	Clear stage 1 through 60 to reach this achievement.
1,000m (Endless Battle) (10 points)	Your distance must be as long as 1,000m to reach this achievement.
5,000m (Endless Battle) (15 points)	Your distance must be as long as 5,000m to reach this achievement.
15,000m (Endless Battle) (20 points)	Your distance must be as long as 15,000m to reach this achievement.
30,000m (Endless Battle) (25 points)	Your distance must be as long as 30,000m to reach this achievement.
70,000m (Endless Battle) (40 points)	Your distance must be as long as 70,000m to reach this achievement.
100,000m (Endless Battle) (50 points)	Your distance must be as long as 100,000m to reach this achievement.