Kill 2 enemies with a single bullet in Single Player or Special Ops.

Complete 'S.S.D.D' and 'Team Player' on Veteran Difficulty.

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

Completed 5 missions in the Arid Badlands

Defeat 100 enemies with headshots

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

Defeat 30 enemies with the Desert - 5

Defeat 20 enemies with the Pistole

Defeat 50 enemies with stealth attacks

Find 30 treasures

Defeat 50 enemies with the Micro - 9mm

Defeat 50 enemies with hand-to-hand combat

Defeat 30 enemies with Mk-NDI grenades