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

Kill an enemy while blinded by a flashbang in the single player campaign.

Complete the game on Hardened or Veteran difficulty.

Complete 'Ultimatum', 'All In', and 'No Fighting in the War Room' on Veteran difficulty.

Corner Zakhaev's Son.

Carry Cpt. MacMillan to safety.

Find 15 enemy intel items.

Find Al-Asad's safehouse.

Survive a dog attack.

Kill 20 enemies with explosives in a single level.

Complete 'Hunted' and 'Death From Above' on Veteran difficulty.

Kill 2 enemies by blowing up a car in the single player campaign.

Kill at least 3 rappelling enemies in a single rope.