The version 1.5 patch for Burnout Paradise has went live this morning, meaning that you can now get started on building your collection.
It was thought that the Trophies were to be retroactive, however it has been confirmed on Criterion's website that they are not as it states "Burnout Paradise saves are locked to your profile. We had hoped to use this to retroactively award trophies, but we discovered during testing that this is not possible. You will therefore require a fresh game-save to receive trophies in Burnout Paradise. If you're familiar with PS3 trophies already, you'll recognise that this works in the same way as all other games that have added trophy support post-release".
The patch only seems to be live in Europe at the moment, however it has been confirmed it will hit everywhere later today.