GUNDAM OPERATION TROY

I tried to get this double boxing by myself and tried for a while and did not get this. I thought I would share what I found out. Basically I got this being a sniper, being out of my mech and shooting another guy out of his mech in the head. It will say head shot in the lower left on your screen. It also looks like this has to be all in one match and possibly with out dying. I would put it on survival and 15 minutes to be safe. Once your friend hops out of his mech destroy that first so he will get it back. If he is on foot it will take forever for him to walk to you. I would pick the first default map and meet in the middle at the broken freeway overpass or better yet the half pyramid building is super easy to spot and has lots of nice perks and ammo around it. Credit to Jonker3262 for helping me figure this out and unlock it.