Discover the true purpose of the Xel’Naga Artifact while at the Skygeirr Platform.
Complete the “Echoes of the Future” mission with Zeratul killing 50 Zerg units on Normal difficulty.
Complete all Bonus Objectives in each of the Final Missions.
Complete all mission objectives in the “Whispers of Doom” mission.
Speak to the following characters before assaulting Mengsk’s Palace on Korhal [Abathur, Zagara, Dehaka, Stukov, Izsha].