Kill 50 supply worth of units within 15 seconds in a Melee game.
Score the rank of Gold in the “For the Swarm” challenge mission.
Complete the “Phantoms of the Void” mission in the Heart of the Swarm campaign.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.
Score the rank of Gold in the “Infestation” challenge mission.