Snowball's chance in hell - Make an enemy flag carrier fall into the lava by freezing the spring in the Helldome level
Operation Alcatraz - Free your entire team in a jailbreak game
Greed before need - Keep an opponent from collecting any weapons powerup after his first death for the remainder of the duel
I do not share power - Kill the enemy leader in an assassination game while playing as the leader of your own team
Rain of vengeance - Kill an opponent with the water shield ammo in the Golem level without cheating