Halo: Reach Challenge Initiative - October 14, 2011

Not as daunting as it may seem. My advice is Griffball - good hammer timing and hogging the enemies respawn point will rack up the Multikills. Also, SWAT and Living Dead offers quick easy kills in succession.

A couple games of Score Attack will knock this one out nicely. Plus you'll be sure to get extra credits for your play time.

Action Sack is great for this, as many of the gametypes are ordnance only. So, it is simply a matter of getting 3 kills.

I would advise playing swat since it is a once shot kill to the head and you will always have you hands on a precision weapon. Also if youhave trouble getting headshots try to keep your crosshair at head level this will meen you mainly have to move in the horizontal plain.

This challenge is very easy. Simply start up Nightfall, skip past all the enemies while keeping to the sides to avoid getting killed, and do the glitch at the end to go through the last gate. Alternatively, you can load up Winter Contingency, stay to the side at all times, and skip past most of the enemies and do it that way. Nightfall is easier, but if you don't know how to do the glitch or cant find out how to, you should do Winter Contingency. Or you can just do a mission legitimately.