Do a 6 combo gem break and receive "For the Swarm" notification in a game of ’StarJeweled’.
Beat the Terra-tron on the Lost Viking arcade machine.
Score the rank of Gold in all the challenge missions.
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.