One Spartan Army - Kill 150 enemies in Firefight Matchmaking - 2250cR
A couple of Scoreattacks or anything from 1 - unlimited Firefights depending on skill. If you Do a couple of Scoreattack x2 though, you can get...
Demon - Kill 50 Elites in Firefight Matchmaking - 3000cR
This challenge. Scoreattack x2 gives you a bunch of Elites to kill in the Final wave. Should only take you 2 games provided you kill them all. It can be a bit touch and go ao a large map might be preferable.
If It Bleeds... - Find and kill the Gold Range-class Elite in any Campaign mission on Normal or harder - 5000cR
Best level for this one is, Nightfall. Within 2 minutes you'll either kill one or restart. Past the first encampment, just before you enter the building where on the other side there's a Grunt on a turret, there can be a Gold Ranger Elite there. If he is, there you go. If now, well there's always the next run-through.
http://halo.wikia.com/wiki/B.O.B
I'd also just suggest bookmarking this link for future reference.
Double Double - Earn 2 Double Kills in the same match in Multiplayer Matchmaking - 2000cR
SWAT can be good here, just saying. Grifball, Infection, Multi-team. once again the quick kill, carnage games are where you want to be.
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