There is a glitch in the game to get the achivement around the globe very easy.
With this glitch, you get 750km in around 2 minutes
To do that, do this settings:
Discipline: Race
Vehicle category: Seasons
Vehicle class: Track day Hypercar
Grid size: 1
Number of rounds: 1
Track: Crescent valley
Route: Oval circuit
Laps: doesnt matter, choose what you want
Car: doesnt matter, choose what you want, I took the Koenigsegg jesko
If you got all settings:
- Start the map
- Drive to the first checkpoint (violet split time at top right corner)
- Press pause
- Select quit (Alt + F4 is an method too, then you can restart the game faster)
- You get back in the main menu, quit the game completly
- Restart the Game and you should get around ~750km added to your total
Just do this again, until you unlock the achievement :D
EDIT 21.10.2022
Thanks to abtNaitY for your message!
The glitch seems to add an different amount of kilometers for every player its not guaranteed that the game will count 750km to your total. It could be more or less, abtNaitY just gets ~150km per use of this glitch, but in the end its much more effective then doing it on the normal way :D