**DISCLAIMER - The game is not fully released and is subject to updates. So far these updates have made the game significantly more difficult and nullified some of my tips. Due to frequent game overhauls this guide may no longer be accurate. I will try my best to keep it updated in a timely manner. **
This isn't a guide per se, but rather a collection of tips and knowledge that I hope will help in getting this achievement. Suggestions are welcome.
1. Only spend gold on getting new cars. You'll want a good number of 3 star cars (at least 4) and will need the cars for The Collector achievement.
2. You will need to replay events to dominate them. Both for the cash and the gold. I dominated 41 of the 72 story events. I also played a limited time event that guaranteed a 3 star car and gave lots of cash. Be sure to play these if they pop up and you have good enough cars.
3. Save your repair kits when possible. You'll need several 3 stars for the last few events, and they're fairly difficult to come by until the final episode. I finished with 72 3 star repair kits. Repairs are no longer star-specific.
4. Do not spend cash on any cars but the ones you use. While you may upgrade them later to reach level 20 for The Collector achievement, I had issues with having enough money for most of the game to upgrade just the cars I used. doing the free card every 4 hours can give you $500 which is pretty significant.
6. It's up to you if you want to increase the difficulty to get better rewards. All you get this way is more challenge cards, not more cash. Challenge cards are only good for upgrade kits (which you'll be swimming in at the end of the game) and a small chance at 5 or 10 gold. In my opinion they are worth it for the chance at gold (only spend on cars!), but I wouldn't go for them if you fall behind your opponent's PR. (They now exclusively give tuning kits (Dec 13, 2018))
7. The final event is a min of 18 races and the final car has a PR of 635. This will require a 3 star car or better. Below is a table of the highest PRs in each event.
8. My best car was a 3 star and had a PR of 639 at Rank 3/4 Level 26/30. My other cars were about 10 points lower than the competition but I managed to win by doing perfect races (perfect starts, breaks + gas). You can miss one or two break/gas and still win most of the time. You can mess up a lot if you're significantly (>25 point) higher than your opponent. If it's a close race you're best off using your boost after every corner (on the straightaways) rather than letting it build up.
The table below lists the shortest and easiest path.
Part | Event 1 | Event 2 | Event 3 | Event 4 | Event 5 | Event 6
E1 P1 | 410(2) | 405(3) | 415(3) | 401(3) | 405(3) | 409(4Su)
E1 P2 | 404(4) | 405(4) | 406(4) | 405(5) | 410(4) | 412(5St)
E1 P3 | 411(3) | 418(5) | 428(4) | 439(4) | 443(5) | 448(4Sp)
E1 P4 | 444(5) | 449(5) | 453(6) | 458(5) | 449(5) | 467(6M)
E2 P1 | 475(5) | 479(5) | 483(6) | 486(5) | 490(6) | 494(6St-Mod)
E2 P2 | 488(6) | 494(6) | 499(6) | 505(6) | 510(6) | 516(6Sp-Mod)
E2 P3 | 408(6) | 513(6) | 517(6) | 524(6) | 530(6) | 535(7M-Mod)
E2 P4 | 529(7) | 534(7) | 540(7) | 545(6) | 551(6) | 556(10Su-Mod)
E3 P1 | 529(6) | 534(6) | 538(6) | 543(6) | 547(6) | 552(6Sp-Cla)
E3 P2 | 546(5) | 552(5) | 558(6) | 565(5) | 571(6) | 577(7St-Cla)
E3 P3 | 577(6) | 583(6) | 587(6) | 595(6) | 601(6) | 607(7Su-Cla)
E3 P4 | 604(7) | 610(7) | 616(7) | 623(6) | 629(6) | 635(10M-Cla)
Su - Super
St - Street
Sp - Sports
M - Muscle
Mod - Modern
Cla - Classic