Establish dominance

The first vehicle (the Tractor) will be unlocked in the early game, and is a useful vehicle for exploring around the map - all vehicles have extra inventory and a built-in crafting station, as well as moving a lot more quickly than you could on foot.

Whilst exploring, you'll see most places of interest have one or two aggressive creatures patrolling around them; just run them over to get the achievement. Running them over is often the easiest way to clear the area before looting it anyway.