Divinity: Original Sin - Enhanced Edition

I assume this is technically story related. Once you get to Cyseal, you'll be given a murder investigation quest. Once you go into the room the body is in you'll be teleported away. After a few story related things you'll be told to teleport away. Once in Cyreal again a dude should give you a little pyramid teleportation thing. Use it, and then pick up the pyramid you spawn by after the conversation for the achievement.