Here is the full list of all 33 Killing Zombies achievements.
Buy the Bolt Action Sniper Rifle
Buy the MP40
10,000 Lifetime Damage
Buy the AK47
1,000 Lifetime Damage
Buy the Combat Shotgun
Buy the Sawn Off Shotgun
Buy the Sledge Hammer
Buy the Pitch Fork
Buy the Golf Club
Buy the Axe
Buy the MP5
Buy the Magnum Revolver
Buy the Baseball Bat
Buy the Crowbar
Buy the Hammer
Buy the 1911
Buy the Police Baton
Buy the Gloc
Buy the Wrench
Play Killing Zombies on Halloween
100,000 Lifetime Damage
1,000,000 Lifetime Damage
Buy the Minigun
Buy the M1 Garand
Buy the Fifty Caliber Sniper Rife
Buy the Thompson
Buy the Uzi
Buy the MP5-Navy
Buy the M16
Buy the SCAR
Buy the SAW
Buy the Grenade Launcher