Complete 20 Heart of the Swarm campaign missions on Brutal difficulty.
Complete all the Evolution missions.
Mutate each Zerg unit in the Evolution Pit.
Discover the true purpose of the Xel’Naga Artifact while at the Skygeirr Platform.
Speak to the following characters before assaulting Mengsk’s Palace on Korhal [Abathur, Zagara, Dehaka, Stukov, Izsha].