Find one treasure

Survive the nightmare of the Scarecrow's fear gas

Use a riot shield to beat down an enemy in Single Player or Special Ops.

Finish the game in Normal Mode

Find 20 treasures

Kill 30 enemies with the Dragon Sniper

Kill 50 enemies in a row without dying

Kill 30 enemies with the MP40

Kill 20 enemies with a brutal combo

Kill 20 enemies with the Desert - 5

Kill 20 enemies with the Wes - 44

Kill five enemies in a row with headshots

Kill three enemies with one explosion