Kill 20 enemy units with the Laser Drill in “The Dig” mission on Normal difficulty.
Using Warp Prisms, warp in 50 units in a single Melee game.
Build a Factory during the first 270 seconds of a Melee game.
Kill 50 supply worth of units within 15 seconds in a Melee game.
Complete the “Whispers of Doom” mission on Normal difficulty with 3 or more Stalkers.