Destroy 30 units with Infested Terrans in an Unranked or Ranked game.
Win 3 1v1 Unranked or Ranked games in a row.
Complete the “Echoes of the Future” mission with Zeratul killing 50 Zerg units on Normal difficulty.
Complete all mission objectives in the “Cutthroat” mission.
Complete the Zeratul storyline in the Wings of Liberty campaign.