In Classic mode, kill five enemies in a single round

Kill a zoomed-in enemy sniper with a sniper rifle of your own

Survive more than 30 seconds with less than ten health in Arms Race or Demolition mode

Win a round by picking up the bomb from a fallen comrade and successfully planting it

Kill an enemy while they are reloading

Win an Arms Race match without dying

Kill an enemy who is dominating you

Kill an enemy whom you are already dominating

Kill an enemy with the last bullet in your magazine (excluding sniper rifles and Zeus x27)

Perform an En Passant during any full game.

Put an opponent in check in an exhibition game.

Win a game of Play By Mail.

Play through the game without reading any hint boxes.