Not too many people in here... Hope I find someone.
Wow, so, you can just only finish the last boss and get the achievement? xD Were it only that simple in DR2. Just finished that btw. :P
Anyways, level 50 here, need a few other achievements, will do those while doing the story in co-op, or while preparing to make that savegame before the boss. Whatever you want.
GT=Forumname. I'm in Europe but flexible. Cya!