AS OF AUGUST 2021 THE SERVERS ARE PERMANENTLY DISCONTINUED, ACHIEVEMENT NOW UNOBTAINABLE.
Well it was a fun ride folks, but EA as always still continues to be the worst gaming company ever. This game was once a very popular achievement game, but unfortunately was left in the dust.
for this achievement you need to select the challenge series menu and find either a sprint race, or a circuit race. (NOTE: Race Wars do not work for online.) then when you select the event, it should say single player, split screen, or online. Select online and then it should take you to a game lobby. press start to search for players. you do not have to win the event but you must complete the event without leaving in order for it to count.
I am willing to help people with this achievement. just message me on TA or xbox live and i will help you as soon as i can.