Halo 4: Challenge Support.

Looking to get EXP without War Games? Or just tying to get “The Challenged” acheivement? Any problems you have with challenges can be posted here! Tips, Support, want a CO-OP party, this is the place to ask(I hope).
If you’ve already completed the challenges provided for the week or the month, feel free to come here and help others out! I can’t possibly help with all tips, but the community can. I’m not a long-time Halo player, the majority of people here are.
I hope this becomes popular at the very least(not to brag) so there is help for many trying to strive towards a goal and achieve something!
I’ll start I guess: I need help with the Oh, It’s On challenge. Any tips that can be provided?
(Oh! I forgot. If there is a post above seeking help, post your own request, and attempt to help with the poster above!)