Asked Robotmen for help just now. But if that doesn't pan out, I'd love to find a partner that will help me out with the online achievements.
And even once I get them, if anyone else gets around to finishing this up and pops in, feel free to ask me. Probably not going to be many taker's since it has been delisted for so long, but there's still some activity here so you never know.
Scored 77k just now on this in Midway Arcade Origins so I don't forsee earning 80,000 in coop on the XBLA release as being much of a problem.