Kill 25 zombies with revolver during a level

Put a zombie on a spear

Kill 50 zombies with submachine gun during a level

Kill 4 zombies with one shotgun shoot

Kill 3 zombies with one crossbow arrow

Kill 7 zombies with one grenade

Eliminate 4 zombies with one barrel's explosion

Kill 250 zombies using the 9mm pistol

Kill 15 explosive zombies

Kill 50 zombie dogs

Kill 5 big zombies

Kill 4 vulture zombies

Kill 200 zombies

Kill 2,000 zombies

Crush 50 zombies using front saws of the bike

Kill 4 creeping zombies

Kill 10 zombies with shooting weapons in melee

Finish the First story level

Finish the Second story level

Finish the Third story level

Finish the Fourth story level

Finish the Fifth story level

Finish the Sixth story level

Finish the story

Finish a level in hard mode

Finish a level in hardcore mode

Finish the story in hardcore mode

Kill a dog zombie

Crash 50 times

Finish a level without taking damage

Buy 50 upgrades

Travel 100 km through hostile lands

Shoot off 100 zombies' helmets

Score 50,000 in any story level

Score 50,000 points in Infinity Sandness mode

Score 30,000 in Zombies' Coliseum mode