Kill 50 supply worth of units within 15 seconds in a Melee game.
Win a 4v4 Multiplayer Custom Game with Elite A.I. allies using the following race combinations against Elite A.I opponents.
Score the rank of Gold in all the challenge missions.
Win a Free-For-All Multiplayer Custom Game against 7 Elite A.I. opponents.
Survive 15 Infested Horde Attacks in the “Night 2 Die" mode of the “Left 2 Die” scenario.