Here is the full list of all 15 Desert Bus VR achievements.
Play for 5 days
Drive the equivalent length of Route 66 (2448mi)
Drive the distance from New York City to Los Angeles (2777mi)
Make it back to Tuscon
Ride along for a complete trip
Make it to Las Vegas
Drive ten miles
Kill a poor, innocent bug
Drive one mile
Get towed all the way to the start
Start the bus
Join a multiplayer game
Play for 10 days
Spend more time on the road than it took to program the game
Drive the equivalent length of Earth's circumference (24,901mi)