Score the rank of Gold in the “Infestation” challenge mission.
Hold a Xel’Naga Tower for 5 consecutive minutes in an Unranked or Ranked game.
Start a conversation with all the main characters.
Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.
Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.