Yes. Or else you cant start standard goals enless you haven't beat them yet. Backup your save file first onto memory of your choice then delete save file this will reset all your goal on all tables as well as settings. Now if your goal is trophies and assuming you collected all NON-DLC trophies, avoid the tables you already have trophies for. Get DLC's trophies then reload your save file,viola!
Hey Rafie,
Do you mean that you're looking for a save file seperate from all the game data?
If so then there isn't one. Sony tied the save directly into the game download so to delete your save you actually have to delete the entire game from your system.
That's what I had to do, but this also means you lose everything except uploaded leaderboard scores.
As for what Abdullah meant above you I'm not sure...