Howto: Stay active on Halo 3 for 24 hours real-time without stopping. Howto: Get an extermination medal with the energy sword in a ranked team playlist. Howto: Kill every other player before anyone respawns in a ranked free for all playlist.
How to unlock: Pop every flood spore on Isolation. How to unlock: Enter someone's forge game and destroy their map. (This is -50g)