if the go that horrible route of GFWL the first thing i will be doing is disabling it. achievements seem kind of silly and pointless to me but to each their own. if they have to go that route i would probably buy it from steam then since steam doesnt interfere with my games like LIVE did. and to be honest they seem to have better achievement anywyas from the few ive compared to LIVES.
Unfortunately, just because you buy it from Steam doesn't mean it won't have GFWL integrated. Although you probably won't have to actively deal with it, unlike the poor bastards that made the mistake of getting games or DLC from that POS.