Mixed list of Buggies available from both the Autoshow & Wheelspins:
2018 Exomotive Exocet Off-Road
2015 Alumni Craft Class 10 Race Car
2015 Polaris RZR XP 1000 EPS
2016 Ariel Nomad
2012 Hot Wheels Rip Rod
1970 VW #1107 Desert Dingo Racing Stock Bug
1969 VW Class 5/1600 Baja Bug
2018 Funco Motorsports F9
2018 Can-Am Maverick X RS Turbo
Just hop around the sand dunes by Bamburgh Castle for a few minutes.
Achievement won't be unlockable until around 3PM BST/GMT+1, 10AM EST, 9AM CST on Thursday 18th June after the Series 23 title update goes live. Anything with persistent tracking (buying the house, the 1 and 200 photos for Horizon Promo) should unlock on getting onto the game after updating.
Edit: update went live early, House achievement is bugged as well as the Van