Folks, we've got good news and bad news. Okay, the good news first: Criterion Games has
released a patch for Burnout Paradise that adds Trophies. The bad news is those Trophies are not going to be awarded retroactively. Despite having
previously stating they were "thinking ahead" with Trophy support, the developers said today, "We had hoped to use this to retroactively award trophies, but we discovered during testing that this is not possible." A new game save will be required.
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Source: Joystiq