To get the achivement around the globe the fastest way is to use an exploit that gets you (in my case 700 km in 1.5 min).To do that do this settings:
discipline race
vehicle category seasons
chicle class track day hypercar ( form my limited testing any seasons car will do)
gird size 1
nubmer of rounds 1

Track crescent valley
rute oval circuit
laps 99(probably dosnt matter)

Car koenigsegg jesko (any should be fine the jesko is the first i can select so lets go with that)

After that start the map , go to the first checkpoint than press pasue , select quit you will be transporrted to main manu , and just quit the game , after that when you go back into the game you should get around 750km added to your total

This is a quick guide sry for misspelss and format , but hey it works
I want to thank @Pampersrocker 🦉 for his find of this glitch/feture

Also i recommend using a keyboard and mouse to get this cause it is faster to alt+f4 after the checkpoint instead of just using a controler and pressing b , ok , b , ok , b ,ok.You will need to rebind the acceliratrion and stearing left/right in the settings but after that it is fast like 1-1.5 to get it done