Complete all the Covert mission achievements.
Win a 1 vs 4 Multiplayer Custom Game with no Allies against 4 Harder A.I. opponents.
Complete the “Echoes of the Future” mission on Hard difficulty in less than 20 minutes.
Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Destroy 4 Zerg Hatcheries in the “Zero Hour” mission on Hard difficulty.