Score the rank of Gold in all the challenge missions.
Score the rank of Gold in the “Opening Gambit” challenge mission.
Have 21 Zerg units morphing simultaneously in an Unranked or Ranked game.
Score the rank of Gold in the “Path of Ascension” challenge mission.
Use the A.R.E.S. to kill the Brutalisk in the “Piercing the Shroud” mission on Normal difficulty.