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I'm sure it does...if you check out some people's profiles on trophy websites (psnprofiles.com for example) and look at some of the platinum achievers, it's obvious they cheated for them and you can tell by looking at the time stamps. I doubt that having someone else's save reassigned to make the system think it's yours will prevent the trophies from being obtained.
PSN: SouthPhillySanta http://i.imgur.com/X6ju8.png http://i.imgur.com/1in5eWo.jpg Yo homie...is that my briefcase?