Rescued the Little Sister in “A Shocking Turn of Events”

Discovered Sledge's Safe House

Earned level 10

Killed 25 enemies with incendiary weapons

Earned level 5

Completed 5 missions in the Arid Badlands

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

Purchase all skills in one category.

Kill 25 unaware enemies.

Kill 35 enemies with the pistol.

Perform 50 headshot kills in the single player campaign.

Complete one optional tomb.

Unlocked 1999 Mode.