Here is the full list of all 42 Guns n Zombies achievements.
Сure once.
Fully upgrade any weapon.
Buy any special ability in the store.
Play 15 minutes in cooperative mode.
Fully upgrade any turret.
Buy 5 weapons in store.
Complete 8 battles on HELL difficulty.
Complete 8 battles on 3 stars
Destroy 1200 Crystal Walls.
Don't use med kits 15 battles in sequence.
Every battle scene has a materia. Find them all!
Complete all levels on 3 stars.
Complete all levels on HELL difficulty.
Complete all levels on HARD difficulty.
Complete the game.
Complete game with Mechanic.
Complete game with Warrior.
Complete game in cooperative mode.
Kill 5000 enemies.
Kill 10000 enemies.
Kill 20000 enemies.
Kill 2000 enemies with auto rifles.
Kill 4000 enemies with auto rifles.
Kill 2000 enemies with grenade launchers.
Kill 4000 enemies with grenade launchers.
Kill 2000 enemies with shotguns.
Kill 4000 enemies with shotguns.
Kill 2000 enemies with sniper guns.
Kill 4000 enemies with sniper guns.
Kill 4000 enemies with turrets.
Play 30 minutes in battles.
Kill 400 enemies with another enemy attack.
Kill 900 enemies with another enemy attack.
kill 15 enemies in 1 seconds with any gun.
Don't use turrets while 10 battles.
Buy any 3rd level tower during battle.
Use any special ability 100 times.
Buy any Electric rifle.
Complete the game as Medic.
Kill 2000 enemies with Electric rifles.
Kill 4000 enemies with Electric rifles.
Complete the N'Aliens campaign.