Score 500,000 points on the Lost Viking arcade machine.
Kill 50 units with a single Penetrator Round in the “Belly of the Beast” mission on Hard difficulty.
Use the Artifact no more than once in the “All In” mission on Hard difficulty.
Complete the “Belly of the Beast” mission without letting a hero fall Incapacitated on Normal difficulty.
Complete all mission objectives in “The Gates of Hell” mission.