Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.
Score the rank of Gold in the “Infestation” challenge mission.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Win 50 1v1 Unranked or Ranked games as Zerg.