Kill all Protoss in the “A Sinister Turn” mission on Normal difficulty.
Kill 15 units with the Giant Ursadon in the “Enemy Within” mission on Hard difficulty.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Score the rank of Gold in the “Infestation” challenge mission.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.