Complete 'Zombie Attack'.

Perform 50 headshot kills in the single player campaign.

Kill 25 unaware enemies.

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

Find 25% of GPS caches.

Kill and loot 10 large animals (deer, boar, wolves).

Kill and loot 10 small animals (rabbits, chickens, rats).

Find 25% of all documents.

Complete one challenge.

Reach the highest point in the world.

20 or more kills with a single Hammerfist dive attack.

Consume 10 //BLACKNET targets.

Deflect 5 missiles at enemies using Shield Block.