Black Mesa Orbital Trajectory Achievement Guide

This video shows how to earn Orbital Trajectory Achievement Black Mesa and how to make a secret jump Orbital Trajectory Black Mesa. In Chapter 15 Xen, as soon as you wake up after teleporting, leave the open cave and go to your right. You need to make your way slowly across, using the stones as platforms. The achievement unlocks once you jump onto the last ledge. End screen template music license Creative Commons — Attribution 3.0 Unported — CC BY 3.0