: The host must have all the tracks unlocked in order to let every player (including host) to earn the Globetrotter achievement. Also, this must be played on ranked match in order to make it worked.
To unlock all the tracks, you must win 200 races in single player mode. Every time you win 8 races, the track is unlocked. The best way to get easy wins to unlock all the tracks is to play single player > custom race > setup AI level to rookie or have a second controller > shadow mode off > cannon only weapon > knockout mode score to 5. Repeat this process until you unlocked all the tracks (or if you like to earn the Motorhead
achievement, just win 20 more times to unlock the last car).
Once done it, setup a ranked match on each of the track of its side, then win the match (or let your boosting partner win in case of achievement trading).