Score the rank of Gold in all the challenge missions.
Destroy 40 units with a single unit in an Unranked or Ranked game.
Use the A.R.E.S. to kill the Brutalisk in the “Piercing the Shroud” mission on Normal difficulty.
Complete all 29 Wings of Liberty campaign missions on Brutal difficulty.
Locate all 13 weapon pickups in the “Piercing the Shroud” mission on Hard difficulty.