Have 21 Zerg units morphing simultaneously in an Unranked or Ranked game.
Score the rank of Bronze in the “For the Swarm” challenge mission.
Score the rank of Bronze in the “Infestation” challenge mission.
Mutate a Lair during the first 285 seconds of a Melee game.
While playing as Zerg, warp in a Zealot in a Melee game.