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

Find 55 treasures

Find 50 treasures

Find 40 treasures

Find 35 treasures

Kill 100 enemies with headshots

Find 25 treasures

Find 20 treasures

Kill three enemies with one explosion five times

Kill 10 enemies with grenades by aiming while hanging from a ledge

Kill 20 enemies melee-attacking from behind

Kill 10 enemies by aiming while hanging from a ledge