Demonstrate killer economic sensibilities by taking down 3 enemies with a single bullet.

Use planks and sticks to make a hoe.

Construct one type of each tool (one pickaxe, one spade, one axe and one hoe).

Silently take out 3 VC.

Buy every weapon off the walls in a single Zombies game.

Sabotage the Soviet space program.

Destroy all targets and structures while making your way up the river.

Complete the campaign on any difficulty.

Break the siege in the battle of Khe Sanh.

Use no more than 6 TOW guided missiles to destroy the tanks in the defense of Khe Sanh.

Use only dual wield weapons to escape Kowloon.