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

Finish the game in Easy Mode

Kill 10 enemies with thrown-back grenades

Defeat 30 enemies with the Arm Micro

Throw back a grenade and defeat two enemies at once

Defeat 30 enemies with the Tau Sniper

Defeat ten enemies in a row, alternating hand-to-hand combat and gunplay

Defeat 20 enemies with gunfire by aiming while hanging

Defeat 30 enemies with the KAL 7

Defeat 30 enemies with the Mk-NDI

Defeat 50 enemies with hand-to-hand combat

Defeat 20 enemies with headshots