One problem I foresee, Microsoft heavily encrypt save games to prevent cheating and to maintain the integrity of the Gamerscore, Sony however do not, so it is highly likely that you'll be able to download hacked save games that unlock the trophies for you, or even programs that do it for any game save. While there were exploits in some games for the 360 that allowed the achievements to be unlocked I see it being a bigger problem on the PS3.
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