This is story related and cannot be missed. You will get this when you first start to explore Hillys, but I'll avoid spoilers by not including any more details.
Please check the comments because there are reports that if you play to the point in this game where you get this achievement in the trial, it wont pop when you buy the full game. If you do want to play the trial, to be safe don't complete the task to get the hovercraft started. Pey'j will ask you to move something, so just quit at that point.