This is story related and unmissable. During the first mission, Welcome to the Oldest House, you are tasked to investigate the noise in the Director's Office. You'll find what looks like a pistol on the floor. Press and hold as indicated by the button prompt. You will be transported to the "Astral Plane" where the game walks you through a tutorial. The achievement unlocks at the end of the tutorial. Note that there may be a slight lag before the achievement unlocks.