Halo 4 Achievment Help

Hey everyone, looking for some people to do some achievments with specifically bros to the close, mortardom, and bropocolypse, if intrested send me a FR on live, GT is Green Gamer1991.

Mortardom is pretty easy. It can be done solo.

Yeah I did Mortardom on my solo legendary run, bloody difficult on legendary though.

yea I tried doing it on legendary, didnt work out well lol. Many achievment guides however suggest to do it co-op to make it super easy, Im willing to help someone get it aswell, like swap roles so we both get it if anyone is intrested.