Score 2000 points in a game of Aiur Chef.
Use the A.R.E.S. to kill the Brutalisk in the “Piercing the Shroud” mission on Normal difficulty.
Kill a Stank before it kills anything on Hard difficulty.
Complete the “Left 2 Die” scenario on Brutal difficulty.
Survive 5 Infested Horde Attacks in the “Night 2 Die" mode of the “Left 2 Die” scenario.