Knife an enemy without him ever knowing you were there in Single Player or Special Ops.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

Finish the game in Normal Mode

Kill 50 enemies with the SAS - 12

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

Kill 50 enemies with the 92FS - 9mm

Find 25 treasures

Find 20 treasures

Find 15 treasures

Kill five enemies in a row with headshots

Kill 30 enemies with headshots

Kill 10 enemies with headshots

Find five treasures