Master Thief 30
Steal 80 flags while playing Capture the Flag or other battle matches.
Go into a player or ranked battle match online. A flag will be on the radar to pick up. When an opponent has it drive into them to steal it. Do this 80 times. Can be boosted easily by driving into each other over and over.
For this you can capture a flag & then have your vehicles touching each other & the flag will transfer back & forth on it's own