Warning - This achievement can be buggy.
After completing the final Master Cup event and having all 1st places on all individual races and each race in all cups the achievement did not unlock.
Annoyed and thinking it was glitched, I tried the old strategy of replaying a race, I re-played the very first race in C class and got a first place finish, that was enough to trigger the unlock.Tips
First lower the difficulty, go to Settings
and reduce the level down to D
to make it easier. Don't forget to switch it back to S rank if you are going to be AFK grinding for money in A Class Plus, Event 6, Takedown
I expect most people will get stuck with the final Rally race on B Class Plus and matching event in A Class Plus, I found these the hardest in the game
B Class Plus - 16. Rally
I had to use a fully upgraded "Evolution" to get 1st in this race.
I first tried in the fully upgraded "Impression" as that what i had used in most of the other races, but it just didn't have the top end to get the distance required.
A Class Plus - 20. Rally
Similar to B Class, I used a fully upgraded takedown car, the "Taurus"
I tried the fully upgraded "Lance" first as that's what I had used for most of the races and had already upgraded it, I won those ok, but it just wasn't quick enough in my hands for this event
I was cautious of over upgrading the "Concept" as advised by JTorto
in their solution comments, in the end I never used the "Concept" for any race in any of the race tyep events, I just stuck to the Lance or Taurus
After blowing all my money on upgrading the Lance I had to AFK grind for money for quite some time to get the Taurus upgraded enough to beat the rally, you do need some luck with course layout.
If this hadn't worked for me, and as i will be going for the completion, I would have moved onto upgrading the concept in stages to see if that worked, but although i didn't need to, that may work better for you
After beating this event the final master cups events it unlocks will seem easy and this achievement will be yours, just be aware of the bug I had.