Alright I got some. ROFLFists - 15GS - Kill 5 hunters on Firefight with a melee attack.(Normal+ Difficulty) Camo? - 5GS - Kill an Active Camo Brute without using the VISR. (Campaign or Firefight, any difficulty) O RLY? - 20GS - Destroy a Phantom in Firefight before it drops its troops.(Any Difficulty) Denied - 20GS - In Firefight destroy a Wraith before it touches the ground.( Any difficulty) Vidmaster Challenge: Unstoppable Rampage - OGS - On 2 player XBOX Live Firefight get a Rampage and an Unstoppable at the same time on Legendary difficulty.