Slay 25 zombies using finishing moves.

Maim 100 limbs.

Survive a plane crash, get bitten, and create your first Zombie-Free Zone.

Collect all keys in single player or cooperative mode.

Get attacked by the girl.

Pass through the orange chute on the girders stage

Get inside a shipping container on the containers stage

Burn a darkness doll in the boiler.

Break the cables supporting a container without falling on the containers stage

Defeat Her.

Reach Room 312.

Kill Eddie.