Kill an enemy with each weapon type including special weapons.

13 Parasite Zombies killed (lifetime)

Complete the third mission of the U.S.S. campaign.

Kill 5 enemies with Blood Frenzy in a single campaign game or multiplayer match.

Purchase an ability.

Defeat Shagohod

Sabotage the Soviet space program.

Use the Fake Death pill

Make Snake throw up

Defeat The Fear

Capture any animal alive

Eat a snake of any type