Complete Campaign Mode On 'Normal'

Complete Mission 10 (Any Difficulty Level)

Kill 10 000 Zombies

Complete Mission 9 (Any Difficulty Level)

Loot 200 enemies.

Kill FeeFee the crab.

Find 25% of GPS caches.

Force an enemy to drop dynamite that kills two people when exploding.

Perform 50 headshot kills in the single player campaign.

Kill 35 enemies with the pistol.

Find 25% of all documents.

Complete one challenge.

Perform 500 Headshots