Speak to the following characters before assaulting Mengsk’s Palace on Korhal [Abathur, Zagara, Dehaka, Stukov, Izsha].
Reach Kerrigan Level 60 in the Heart of the Swarm campaign.
Complete “The Growing Shadow” mission in the Legacy of the Void campaign.
Complete the “Into the Void” mission in the Legacy of the Void campaign.
Play enough qualifying games to get placed in a Matchmaking Ranked League.