Complete the “Echoes of the Future” mission with Zeratul killing 50 Zerg units on Normal difficulty.
Don’t train additional SCVs before purchasing Han’s contract in the “Cutthroat” mission on Hard difficulty.
Complete all 29 Wings of Liberty campaign missions on Hard difficulty.
Complete the “Ghost of a Chance” mission using Dominated units to kill at least 15 enemy troops on Normal difficulty.
Save 2 Colonist Outposts in the “Safe Haven” mission on Hard difficulty.