If anyone needs help with the halo anniversary campaign achievements im willing to help
https://forums.halo.xbox.com/yaf_postst3161_HALO-ACHIEVEMENT-HELPER-PROGRAM.aspx
You might want to use that topic to find some people who need help 
I need help with “over shields are for -Yoink!-”, and “walk it off”.
> I need help with “over shields are for -Yoink!-”, and “walk it off”.
Don’t you just go through the first level without getting the overshields or health packs? Just try not to take health damage. I managed to do it until I got to the stairs part and died 20 times.