Halo: Reach Challenge Initiative - Aggressive Negotiations
Earn at least 17 kills in a multiplayer Matchmaking game.
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Grifball has lots of kills involved with it. 17 kills is ~5 in a 3 round game or ~3 in a full 5 round game.
'Living Dead' playlist is a good way to get this. there is 3 rounds and if your a survivor each round and a good shot with the shotgun or pistol this should easily be achieved. Also Team swat is another quick fire playlist that you should easily be able to achieve this.