Story related. As you progress through the Wilkerson's part of the quest/story you'll eventually be tasked with acting as the neutral party for an arms dealer between the Wilkersons and another community. Head to the rendezvous to pick up the other people, then bring them to the Jurassic Park place East of there to finish the deal. Oddly enough you end up leaving them there, so who knows what happens to them, but at least you get an achievement.
Note: You can miss this achievement if you listen to Lily when she asks you to stop working with the Wilkersons. Ignore and complete their quest chain.