This trophy isn't too hard to get. I think you have to be Trevor to get this trophy but I'm not 100% sure. What you need to do is wait for a random encounter that makes you drive someone to their destination, instead of doing that head toward Mt. Chilliad and drop them off at the cult Altruist Acolyte hideout. There should be a message pop up in the top left saying you can drop them off at the cults hideout and it will mark the location on the map. What you need to do is set a waypoint and drop them off there. Once you get there the trophy should pop after dropping them off.