Start the Single Player Campaign on any difficulty.

Stand on the crocodile in the Secret Library

Complete act IV.

Beat Solomon, flawlessly, in The Great Destroyer

Captured Al Bashir

Destroyed 6 enemy tanks before reaching the fort in Thunder Run

Found the nuke

Protected Chaffin from the soldiers in the street in Operation Swordbreaker

Find the Strange Relic

Kill an Infected with a grenade blast.

Kill 250 zombies using edged melee weapons.

Kill 50 human enemies.

Kill a Suicider with a grenade.