Halo Reach Daily and Weekly Challenges Guide - 3/19/12

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The Challenges:
More than a Handful - Kill 77 enemies in multiplayer Matchmaking. - 3500cR

Seventy-seven kills is not too bad, but you will actually need to go out of your way to get the kills for this challenge.  If you can score about twenty kills a game, while going for the "Chaddlesby's Justice" challenge, you are likely in good shape.  And, that many kills per game can be achieved in a single game of Grifball or Multi Team if you are lucky.  Or you can just go play in a playlist that you enjoy since it really is not a lot of kills.  Just have fun and the kills will come.  That is how it normally works.

Flat Tire - Kill 10 enemy vehicles in Firefight Matchmaking. - 2343cR

Firefight Arcade is now your best option for this challenge since the matchmaking update returned Drop-ships to Firefight Arcade. I would head for any game with power weapons on the map Beachhead as it will likely give you one vehicle to kill just about every wave, whether it is a Ghost or a Wraith. You will have teammates to compete with for the kills, however, so once you get that last vehicle kill for the challenge, lay off and let your teammates pick some up. You can also get this in Score Attack on the map Holdout, but that is not recommended as it can take a long while.

There Are Many Like... - Kill 50 enemies with precision weapons in the Campaign today. - 1500cR

You will need to score fifty kills with precision weapons in campaign, which include the DMR, Sniper, Needle Rifle, and the Covenant Focus Beam Rifle.  Perhaps the easiest way to complete this challenge is to play the mission ONI: Swordbase as it starts you with a precision weapon and a bunch of targets.    As long as it does not have shields or a helmet, you should be able to deal a one shot, headshot kill.  You should be able to finish off the challenge but, if need be, you can go onto Nightfall to score some kills with the Sniper.

Chaddlesby's Justice - Avenge your teammates' deaths 7 times in multiplayer Matchmaking. - 3680cR

Avenging your teammate is done by killing an opposing player after he/she kills one of your teammates and before anyone else does.  There is some sort of time limit on this, though I am not sure what it is.  This should, however, be even easier in SWAT since the kills occur much faster.  If you are having trouble getting the "Avenger" medal in the SWAT playlist after many tries, then I would try out some Grifball since you should be able to avenge teammates quite often in that playlist.

The Weekly Challenge:
Co-op Dash - Clear any Campaign mission on Heroic, in co-op, in 15 minutes or less. - 15343cR

As usual, the best way to get through and campaign level fast is by just running through the level Nightfall, a guide to doing so which can be found right here. Co-op does present some challenges to completing the level, but they are all easily solved by just running together as close as possible and knowing where you need to go. You can also just complete this challenge by having an idle controller on as the second player and running through by yourself. The other player will teleport to you position at certain points, but it should not be in any dangerous areas.