This is obtained by gaining 1,000,000 XP.
The online levels can be boosted if you do not enjoy racing competitively. XP is awarded for the following:
*Completing flying laps
*Qualifying in the top 3
*Finishing in the top 10.
*Completing a lap without incident (no crashes)
*Completing a lap
To set up a boosting match, go to multiplayer and create a session. Set it to private and invite your friend. You can change all of the simulation settings and alter the race distance. The quickest way to boost, is to set up a 19 race season (all at Montreal), one lap, ten legendary AI, collisions and flags off. Take turns winning, making sure to finish 1-2. Cut corners to make it easier. You should be able to get 30,000-31,000 XP per hour following this method.
You can check your total XP on the leaderboard.
Head to the Achievement Trading Thread to find a boosting partner.