State of Decay 2: Juggernaut Edition

Start a new campaign and opt to skip the tutorial. When asked where you want to settle at choose Cascade Hills. Pick your starting three survivors and then start.

You'll begin near a car that has run out of gas and talk about settling down. Proceed to the base that's marked on your map, it's a short run from where you started. When you get to the base kill all the zombies inside and then go to the claim spot (marked by a white flag inside the house) and claim the base. This will unlock your achievement.

This achievement can be obtained at the end of the tutorial. You have to choose this location when you are asked, where you want to start your first settlement. Be aware that there are other achievements connected to the other locations, too. The tutorial only takes a couple of minutes to get through, though. So no need to worry about these achievements at all!