Survive 15 consecutive waves with each of the 4 characters.

Complete act I with 4 different characters.

Survive 30 consecutive waves with at least one co-op player.

Explore the entire island.

Survive 15 consecutive waves using the analog combat controls.

Survive 10 consecutive waves using only custom weapons.

Use a large medkit to heal an injury of 5% or less.

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

Survive wave 30.

Kill 25 zombies with your bare fists.

Kill an Infected with a grenade blast.

Set 10 zombies on fire simultaneously.