Test Drive Limited
Rare5.4%All-the-thingsOptionalAnywhere
Drive at least 999 km during jobs with each truck brand featured in the game. Only your owned trucks are counted. (MAN, DAF, Mercedes-Benz, Renault, Iveco, Scania, Volvo)
The easiest way to approach this is to pick one truck and drive it until you've covered 999km - and when you see the achievement progress tick up a notch. Then switch to a truck of the next brand and do at least 999km in that until achievement progress ticks up. Rinse and repeat and you'll get there.
Make sure to tick the brands off on the checklist here as there's not an easy in-game way of keeping track of which ones you've already done.
999km sounds like a lot but isn't too far given the time/distance compression in the game - it won't take long for each truck.