Make Way

To unlock this achievement you will need to race with every car.
Some are available by default at the start of the game, others are unlocked as you level up.
The achievement tracks progress

List of cars and when they unlock for manual tracking:
Jato (level 29)
Ufology (level 46)
Due Process (level 33)
Wolf's Bane (level 35)
Bulletproof (level 38)
Mammoth (level 12)
Time Machine (level 5)
Tiger Express (level 25)
Touge (level 40)
Papyrus (level 41)
Betty (Default)
Memphis (Default)
Alpinist (Default)
Synthwave (Default)
Axel (Default)
Tomcat (Default)
Grandpa joe (Default)
Falcon (level 16)
Cottonmouth (level 19)
The Raven (level 50)
All Access (level 9)
Silver Grey (Default)
Municipal (level 22)
Axeman (level 44)
Gargantuan (level 48)

First you must unlock every vehicle which requires you to reach level 50, then you must simply race, not win, with each car. I suggest you keep track of which cars you used and use a different car every time you load a race. An easy method is to use all the cars available at the start, then immediately use a new whenever you unlock it from leveling.