Kill 20 enemies by shooting from the hip (without aiming with the L1 button)

Find 50 treasures

Kill 100 enemies with headshots

Find 35 treasures

Kill 50 enemies with the AK-47

Find 25 treasures

Find 20 treasures

Kill 30 enemies with headshots

Kill 10 enemies by aiming while hanging from a ledge

Kill five enemies with a brutal combo

Find five treasures

Reach Tier 4