Contrary to the "Discontinued" trophy flag, this trophy is still obtainable, while a little buggy.
In order to get this trophy quicker, I would start a Weekly Community Event on Sunday afternoon. You do not have to win, just simply finish the event and rank on the leaderboard. Once it is Monday morning at 11am GMT, you will get credits from your positioning in last week's event, then start another weekly event and finish that one.
When Monday morning at 11am GMT arrives, you will get credits from your positioning in the previous week's event, and the trophy should pop once you're able to select another weekly event.
Unlike some "solutions" on the Codemasters' forums, you do not need to play both weekly events in both weeks. I only needed to play one event one week, and the other the next. However, if you have done one event per week and the trophy still hasn't popped, try both events.