Wow dude seriously?
I know trophies/achievements are fun to get but there are problems with having online multiplayer centric trophies. For most games the online component becomes null and void after a year or two as people move on to newer games (unless you are talking COD). So if someone decides to buy the game a few years after the release, they won't have access to trophies at all. I for one love trophies and wouldn't mind them being MP based, but I can clearly see the problem of doing so.