This is the 1st championship in the first driveclub tour.
You do not need to win all 3 races, just finish 1st overall.
If you do muck up you can restart the round (race) and not the whole championship, if you are on the 2nd or 3rd race and keep your current championship points.
*Note on the 3rd race if you muck up restart before finishing the race as you cannot restart the round once you have finished the race.
Once you get to the final standings after the 3rd race and have won the championship overall the trophy will pop.