Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
Chuck 'em (5 points)	Throw 1000 grenades.
Crabby Pants (10 points)	Kill 100 crabs.
Crafty (20 points)	Unlock all weapons in the game.
Dodgy (50 points)	Avoid damage by rolling 50 times.
Domination (100 points)	Get 5,000 points in every survival difficulty.
Eye of the Tiger (25 points)	Survive till wave 25 in survival mode.
Flawless Victory (20 points)	Complete a level without taking any damage.
Hurtin' fer certain (5 points)	Take 1,000 points of damage.
In It To Win It (100 points)	Get 10,000 total points.
Itchy Trigger Finger (50 points)	Fire 100 projectiles.
Learn the ropes (20 points)	Complete the tutorial.
Major Victory (60 points)	Defeat story mode on normal.
Man on Fire (20 points)	Kill 20 enemies in 60 seconds.
Medic (20 points)	Heal 200 points of damage.
Minor Victory (40 points)	Defeat story mode on easy.
Neophyte (100 points)	Complete story mode without buying any upgrades.
Resistance Hero (100 points)	Beat story mode on all 3 difficulties.
Supreme Victory (80 points)	Defeat story mode on hard.
Turn the tide (100 points)	Kill 500 enemies.
Unyielding (75 points)	Complete story mode without rolling.