Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.
Destroy all Protoss structures in the “Welcome to the Jungle” mission on Normal difficulty.
Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Complete all 29 Wings of Liberty campaign missions on Brutal difficulty.
Pre-purchase all of the StarCraft II: Nova Covert Ops Mission Packs.