Kill a Stank before it kills anything on Hard difficulty.
Destroy all Rip-Field Generators in the “Maw of the Void” mission on Normal difficulty.
While playing as Zerg, warp in a Zealot in a Melee game.
Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.
Complete any 25 rounds in “StarCraft Master".