Don’t train additional SCVs before purchasing Han’s contract in the “Cutthroat” mission on Hard difficulty.
Prevent the Protoss from capping a Tal’darim Altar in the “Welcome to the Jungle” mission on Hard difficulty.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Complete 25 missions in the Wings of Liberty campaign on Hard difficulty.
Score the rank of Gold in all the challenge missions.