Set 10 zombies on fire simultaneously.

Use a hammer to kill a series of 15 zombies without taking damage.

Sever 100 limbs.

Complete 25 quests while playing with at least one co-op partner.

Complete act 1.

Breach a locked door with the first blow.

Survive wave 30.

Kill 250 zombies using firearms.

Survive 15 consecutive waves using the analog combat controls.

Survive 5 waves using only your fists and legs.

Create a customized weapon.

Kill a zombie with 10 different melee weapons.

Complete 5 quests with 3 co-op partners.