Halo 4 War Games Daily Challenges - 12/23/12

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The Challenges: 
Got Backup - Get 12 kills with a Secondary Weapon. - 1250 XP
Secondary weapons in Halo 4 include the Magnum Pistol, the Plasma Pistol, and the Bolt Shot. You are only really likely to score kills with the Magnum and Boltshot as the Plasma Pistol will likely just end up getting you killed. Now, you just need twelve kills over the day, not in a single game. The best place to get these kills, however, will be in a gametype like SWAT where you can just score easy headshots. If that is your plan, you will want a smaller map like Adrift or Haven, since the Magnum will get raped by a DMR or BR on the larger maps. If you are just playing normally, twelve secondary weapon kills will likely take three to four games to complete.

Exterminate! Exterminate! - Kill every member of the opposing team at least once in a match. - 2750 XP
So, this probably happens way more often than you think it does. There is actually a commendation that tracks this. You do need to kill every member of the opposing team, just not at all once. This probably happens more often than not without you even noticing it. You will want to stick to gametypes with a low number of players per team. This means Team Slayer Pro, Infinity Slayer, or SWAT. Each one of those gametypes has teams of four players maximum. I'm not entirely sure how people joining and leaving the game effect this stat, but most likely you will need to have killed every player who is on the team once the game ends. Should take a game or two to complete.

See the War Games Monthly Challenge here.
See the War Games Weekly Challenges here.
See the Campaign Weekly Challenges here.
See the Spartan Ops Weekly Challenges here.
See the Weekly Waypoint Challenge here.