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 Easy Mode

Find 20 treasures

Defeat 20 enemies with the Pistole

Defeat 70 enemies with the M4

Defeat 50 enemies with hand-to-hand combat

Defeat 20 enemies with headshots

Defeat 20 enemies with hand-to-hand combat

Good guys stand up and take the heat.

Good guys feed the needy.

Save a Buddy from a mortal wound