Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
4,000 Points	Collect 4,000 points.
8,000 Points	Collect 8,000 points.
Balloon Smasher	Pop 75 balloons in Ninja Slide.
Bubble Ride 150	Score 150 points in Bubble Ride.
Bubble Traveler	Travel in 100 bubbles in Bubble Ride.
Combo King	Get 10 combos in one level.
Completed 10	Completed 10 challenges.
Completed 40	Completed 40 challenges.
Energized	Score 50 points in energy bonus.
Ninja Slide 1500	Score 1500 points in Ninja Slide.
Perfect Landing	Scored 50 points in landing bonus.
Star Collector	Collect 500 stars in Ninja Slide.
Three-starred 20	Get three stars in 20 challenges.
Three-starred 40	Get three stars in 40 challenges.