Complete all the Evolution missions.
Reach Kerrigan Level 40 in the Heart of the Swarm campaign.
Purchase 10 infantry upgrades from the Armory console.
Speak to the following characters before assaulting Mengsk’s Palace on Korhal [Abathur, Zagara, Dehaka, Stukov, Izsha].
Discover the true purpose of the Xel’Naga Artifact while at the Skygeirr Platform.