Call of Duty: Modern Warfare 3 achievements

Complete "Mind the Gap", "Goalpost", and "Return to Sender" on Veteran difficulty.

Destroy 3 tanks with a single 105mm shot in "Iron Lady."

Complete a Special Ops Mission Mode game on Hardened or Veteran with no player getting downed.

Kill 5 enemies with a single grenade.

Complete "Black Tuesday" and "Hunter Killer" on Veteran difficulty.

Complete a Special Ops Mission Mode game with the same number of kills as your partner.

Complete the campaign on Hardened or Veteran difficulty.

Take down a chopper with an AC-130 smoke grenade in "Bag and Drag."

Finish a Juggernaut with a knife.

Kill 20 enemies with the Chopper Gunner in a single run in "Return to Sender."

Kill 2 enemy helicopters without getting hit in a Special Ops Survival game.

Melee 5 enemies in a row.