Click select, go to your phone, and call Velociraptor Ned.(Chicken Ned's prehistoric ancestor)
He unlocks once you finish "Friend of the Raptors"
Just don't start any missions or he will leave and you have to call him again.
you can still obtain collectibles and hack stores without him going away.
Hopes this helps pm me or comment if you have any questions or anything to add to the solution. If you give me a negative vote please comment or pm why so i can fix it.
*UPDATE* This achievement could take longer than 30 minutes it seems to be glitched for some people and you might have to finish a side quest for it to unlock.