Credit goes to II SkyLander II for discovering and confirming this solution.
The fastest way to get this achievement is to win 200 rivals that pay 5000 each and here is how.
Get a rival on a circuit race, who pays 5000 and whose time you can beat on the first lap, then after finishing the lap faster than him the game will ask if you want to finish, press
ONCE, then at the stats screen press
to restart and confirm it with
, and the trick is you will be doing the same race again and earning the money again! You can see that you earned the reward in top right corner before you start the race again.
You can keep doing this for as long as you feel like, BUT ONCE YOU CONTINUE
, you will have to deal with THE BEST TIME
Any bonuses are useless, even the 10% more money from rivals perk because only money that goes towards the achievement is the bounty money, so I race using all assists, except braking and steering assists.
Festival Circuit in Casteletto is a very good spot to do this in Sports Car, Classic Performance or Street Rival, because these are starting classes and you can easily find easy rival with 5000 reward. I do it with Skyline GT-R V-SPEC (R34) fully upgraded to S2.
Best cars in my oppinion- Nissan Skyline GT-R R34 (Sports Car), Nissan Skyline GT-R R32 (Street Rival) and Ferrari Dino (Classic Performance), all must be fully upgraded to S2.
With this solution you can get this achievement in 4 or 5 hours.
You can check your progress in statistics, scroll down General stats and see Money made from rivals.
Achievement unlocks while in rivals, you dont have to quit racing for it to unlock.