I'm not sure I see the validity in complaining about people going for achievements in these DLC playlists. It's the main reason a ton of people are either starting to play Halo or getting back into Halo - to go for the new 250 points. If you didn't expect over 2/3 of the people on DLC BTB or DLC FFA to veto the game/map to get Avalance CTF or Blackout Oddball then you're only kidding yourself.
And, of course people are going to ask for help in getting one or two of the achievements, especially the Warthog chaingun turret kills because you need a dedicated driver to help you out.
Also, team killing/cursing out these kids who want achievements solves nothing and even adds more fuel to the fire. Hell, I'm sure if you make it your goal to team kill "boosters" then an eventual ban isn't out of the question. I got team killed in my very first match after this update because some kid wanted in the Warthog gunner, and I didn't cry and publicly whine about it - I just got in another one, got the achievement and then the double kill one with it. I've even gotten messages asking to boost or invites to a party wanting to grab these achievements - just ignore/block them. If you can't stand this current situation with achievement boosting/asking for help, then go ahead and sell your game before the next 500 points hit or don't buy the new maps. This batch of people who want to boost 250 will last like 2 weeks or so, but the group going for the last 500 won't go away for a while.