Complete all the challenge missions with a Bronze rating or higher.
Destroy all Rip-Field Generators in the “Maw of the Void” mission on Normal difficulty.
Complete 20 missions in the Wings of Liberty campaign on Hard difficulty.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Destroy 6 units with a single Seeker Missile in an Unranked or Ranked game.