Kill 20 enemies melee-attacking from behind

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

Finish the game in Normal Mode

Kill 50 enemies with the SAS - 12

Kill 50 enemies in a row without dying

Find 35 treasures

Find 30 treasures

Find 20 treasures

Kill 20 enemies with a brutal combo

Kill 100 enemies with headshots

Kill 30 enemies with headshots

Kill 10 enemies with headshots