Driving every single one of the game's 28 unique vehicles will unlock the following achievement:
Almost all of the vehicles can be found very early on, many of them just driving around and parked in car parks. The auto shop on the first island also serves as a good base for building towards unlocking this achievement.
It should also be noted that you can buy cars from very early on in the game, with the list opening up to the last few vehicles as you progress into Act II, and finally Act III. It's highly likely you'll have already driven them all by the time they become purchasable though!
As well as the locations below, you may find the odd rare vehicle driving around. Feel free to grab it there and then. This includes tractors, hearses, garbage trucks, mail trucks, and flatbeds.
Finally, some vehicles are exclusive to the missions they are driven in. These are clearly marked in the table below.
Here's the full checklist: Print it off or load it into your favourite spreadsheet editor to mark them off as you go.
| Vehicle | Found | Act |
| Armadillo | Dwayne's | 1 |
| Armoured Truck | Driven during Fixer missions 'Security Job' and 'The Heist' | 1 |
| Astro ZX | Car Dealership | 1 |
| Bison | Car Dealership | 1 |
| Buzzard GTX | Driven during Dwayne mission 'Clue? The Killer's Car' | 1 |
| Classic Van | Car Dealership | 1 |
| Flatbed Truck | Driving around rarely | 1 |
| Garbage Truck | Landfill Site | 1 |
| Hearse | Driven during Undertaker missions; can be found driving around rarely | 1 |
| Jeep | Get a six star wanted level and keep it up until the army arrives | 1 |
| Jefferson | Car Dealership | 1 |
| Kamara | Car Dealership | 1 |
| Loader | Quarry, northwest of Spray + Fix | 1 |
| Mail Van | Mail Centre | 1 |
| Minivan | Car Dealership | 1 |
| Muskateer | Car Dealership | 1 |
| Pickup Truck | Car Dealership | 1 |
| Police Car | Everywhere | 1 |
| Police Van | Get a five star wanted level and keep it up until the SWAT arrive | 1 |
| Quinzo | Driving around | 1 |
| Revelle | Car Dealership | 1 |
| Roosevelt | Car Dealership | 1 |
| Tank | Get a six star wanted level and keep it up until the army arrives | 1 |
| Tow Truck | Dwayne's | 1 |
| Tractor | Parked near the lock up, east of the time trial near Dwayne's | 1 |
| Forklift | Driven during the Wilde mission 'Blue Collar Blues' | 2 |
| Hot Rod | Driven during Dwayne mission 'Hot Rod Fever' | 2 |
| Ambulance | Outside Redrock Hospital in Ridge Plains | 3 |
| Vintage Truck | Driven during Rusty's mission 'Rusty's Test' | 3 |
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