Game Center achievements

Complete the following tasks to unlock Apple Game Center achievements.

Achievement How to unlock
10,000 Obstacles Destroy 10,000 obstacles.
100 Points Get 100 points in one round.
25 Points Get 25 points in one round.
50 Points Get 50 points in one round.
50 UFOs Destroy 50 UFOs.
Endurance Master Play 120 seconds without crashing.
Long Lasting Play 60 seconds without crashing.
Missile Masher Destroy 10 missiles in one round.
Persistent Play 30 seconds without crashing.
Rock Remover Destroy 25 rocks in one round.
Speedy Bullets Fire 150 bullets in the first 60 seconds.
Tree Trasher Destroy 30 trees in one round.