Have 21 Zerg units morphing simultaneously in an Unranked or Ranked game.
Complete the “Whispers of Doom” mission on Hard difficulty without Zeratul suffering life damage.
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.
Destroy 10 cloaked or burrowed units in a single Melee game.