Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
Bruno The All-seeing Killer	Kill 100 Bruno The All-seeing.
Chainsaw Hewett Killer	Kill 300 Chainsaw Hewitt.
Complete Hard Mode	Complete Hard Mode.
Complete Normal Mode	Complete Normal Mode.
Dan Goldquiff Killer	Kill 50 Dan Goldquiff.
Franken-Ken Killer	Kill 100 Franken-Ken.
Hypno-Jello Killer	Kill 200 Hypno-Jello.
Jiang Shi Foo Hunter	Kill 300 Jiang Shi Foo.
Kappa Boy Killer	Kill 50 Kappy Boy.
Luscious Livvy Killer	Kill 30 Luscious Livvy.
Mummy's boy Mike Killer	Kill 300 Mummy's boy Mike.
Rabid Ron Killer	Kill 300 Rabid Ron.
Roger Rattlebone Killer	Kill 300 Roger Rattlebone.
Saucerrr-er Killer	Kill 30 Saucerrr'er.
Schiz BellyAche & Chill Killer	Kill 200 Schiz, BellyAche & Chill.
T.N.T. Killer	Kill 200 Trouble, Nuisance & Trickery.
The Iron Duke Killer	Kill 30 The Iron Duke.
Uncle Bazooka-Bones Killer	Kill 100 Uncle Bazooka-Bones.
Venom Killer	Kill 100 Venom.
Vince Vampilot Hunter	Kill 30 Vince Vampilot.
Weedy Killer	Kill 100 Weedy.
Zombie Frank Killer	Kill 200 Zombie Frank.