Complete the “Belly of the Beast” mission without letting a hero fall Incapacitated on Normal difficulty.
Score the rank of Gold in the “For the Swarm” challenge mission.
Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.
Score the rank of Gold in the “Infestation” challenge mission.
Kill 150 Zerg units with the Artifact in the “All In” mission on Normal difficulty.