Trophy Missing

So, I've completed the game, got every trophy bar 1 which is the urban outlaw trophy where you beat magnus walker's time in his car and get trophy which I did by 10 seconds. however, I didn't get it which is really annoying because I like platinum trophies for games and its the only one that is missing. I tried repeating the challenge in same car later and beat my own time by a lot and I'd rather not have to reset my progress as I've done 93% overall game progress and have 3 great cars with 2 fully upgraded and 120k in bank and amassed a total of 60 hours game time. If there's no way of getting it without resetting, that's so annoying. It would be good if you could reset the missions to start but keep everything like new game + mode, I'd be happy with that if it meant i can get trophy but it should've been given when I first beat the race.