Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Find out why Tychus Findlay is always in a Marine suit.
Complete “The Outlaws” mission on Hard difficulty in less than 10 minutes.
Complete the “Echoes of the Future” mission on Hard difficulty in less than 20 minutes.
Kill the Marauder Kill Team in “The Great Train Robbery” mission on Normal difficulty.