Chapter One
During the first instances with your control of Louis, you'll end up moving up the dock and talking to Emily. She will try to remember what your job is, and this will be your option to open the path trees from three distinct class roles. Note that choosing one does not prevent you from choosing the skills in the others later down the line; just wait until you have some points in them before finishing them off. This trophy is also tied to two others:
To get this trophy, choose the Occultist class.