Survive 10 consecutive waves using only custom weapons.

Survive 5 waves using only your fists and legs.

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

Set 5 enemies on fire and then kill them with explosives.

Find 120 collectibles.

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

Play any Arena in co-op.

Kill 250 zombies using blunt melee weapons.

Kill 50 human enemies.

Complete act II.

Find 60 collectibles.

Kill 250 zombies with modified weapons.