Destroy a total of 100 zombies.

Destroy a total of 10,000 zombies.

Destroy a total of 1,000 zombies.

Destroy a total of 100,000 zombies.

Blow up 5 zombies with a single rocket.

Extinguish 5 burning zombies with the Cryogun.

Smash 5 frozen zombies with the chainsaw.

Roast 1000 zombies with the flamethrower.

Evaporate 1000 zombies with the tesla rifle.

Fully upgrade a skill.

Fully upgrade a weapon.

Vanquish 1000 zombies with melee weapons.

Defeat 30 zombies in a row while your health is below 20%

Slay 4 or more zombies with a single sniper round.

Survive for a full minute without slaying a single zombie.

Earn a score multiplier of x10.

Reach a score multiplier of x20.

Slaughter 1000 zombies who are stunned by flash grenades.

Reach a score multiplier of x30.

Liquify 1000 zombies with explosives.

Heal your co-op partner with a medkit while their health is below 20%.

Freeze 5 zombie with a single blast from the Cryogun.

Rescue your co-op partner by destroying a zombie which is currently attacking them.

Complete a level of difficulty 5 or higher with full health.

Smash 5,000 destructible objects.

Fire 100,000 rounds from automatic weapons.

Destroy 1000 zombies with a shotgun.

Traverse a total of 100 miles.

Complete a level while only using a single weapon.

Collect a total of 50 items in a single stage.