Kill 50 supply worth of units within 15 seconds in a Melee game.
Morph 20 Zerglings during the first 255 seconds of a single Melee game.
Score the rank of Gold in the “Infestation” challenge mission.
Destroy 10 cloaked or burrowed units in a single Melee game.
Kill the Marauder Kill Team in “The Great Train Robbery” mission on Normal difficulty.