Find 30 enemy intel items.

Get a kill with each type of handheld gun, explosive and launcher in the single player campaign.

Destroy 8 enemy helicopters in 'Heat'.

Find and use the hidden cache in 'Heat'.

Kill Makarov and complete your mission

Complete any level using only the knife to kill enemies.

Alert the enemy helicopter in 'All Ghillied Up' and take it down.

Complete the game on Hardened or Veteran difficulty.

Sky dive to safety on Veteran difficulty.

Complete 'Game Over' on Veteran difficulty.

Kill 3 enemies in a row with your knife in the single player campaign.

Corner Zakhaev's Son.

Carry Cpt. MacMillan to safety.