So I jumped back into Halo 3 to try to clean up the remaining achievements, but I believe I am going to fall just short of 100% completion.
The Overkill and Two For One achievements must be done in Lone Wolves, as it is the only ranked FFA playlist in Matchmaking. I think that it is a lot harder to get these two achievements now compared to when Halo 3 first came out. I say that, because me being a 40 in Lone Wolves does not make things easy when I am matching high level players lol. It is mostly only the hardcore Halo 3 gamers that roam the ranked playlists now and the majority of the high level Lone Wolves players are very decent and competitive.
I think I will just try a couple of games a night or something and see what happens. Who knows, maybe a lucky situation will come up eventually. I just see these two achievements being pretty hard to get nowadays, but any advice would be greatly appreciated.