You must earn 1,000,000 career points with the Snow Pirate Elites Faction. The easiest way is to boost this on episode 5, chapter 2 on Extreme (Beat the game on hard to unlock Extreme) as a non-host. Basically, get a friend to host and to invite you. Remember to use the Superstar Ability and to use the Cannon in the second area and you'll earn 60k - 75k each time you do this (Have your friend shoot you with enough T-Energy to get the Cannon to a level 3 shot). Also, I promise you that this level is a push-over even on the hardest difficultty if you are experienced and know what to do.