Score the rank of Gold in all the challenge missions.
Complete all 29 Wings of Liberty campaign missions on Hard difficulty.
Have 21 Zerg units morphing simultaneously in an Unranked or Ranked game.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Use the A.R.E.S. to kill the Brutalisk in the “Piercing the Shroud” mission on Normal difficulty.