One Spartan Army - Kill 250 enemies in Firefight Matchmaking - 3500cR
A few games with a bunch of kills. Go for other challenges first.
Flat Tire - Kill 10 enemy vehicles in Firefight Matchmaking - 2343cR
Holdout gives you a Banshee ever once in a while, as will Installation 04. So any game mode on these will work, the longer the game the more you get. I think you can get 3 in the time for a Scoreattack game. I'd suggest using a Sniper/Grenade EMP to destroy it as they dodge rockets rather gracefully.
Other ways to do it are Arcadefight on large maps (usually one per round) and original Firefight.
Demon - Kill 30 Elites in Firefight Matchmaking - 2400cR
Scoreattack x2 and Arcadefight with its Heretic rounds are the best way for this.
A Simple Spree - Earn any spree in Firefight Matchmaking - 2000cR
Killing spree at 10, or a special spree at 5 (Wheelman, Sniper, Shotgun or Sword are most likely)
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