I made a quick video showing where I've seen the Shadowman appear as there is a lot of confusion with unlocking this achievement; How did I see him? What does he look like? Where was he? I didn't see anything, yet I got the achievement?
This achievement will pop if you don't physically *look* at the Shadowman, but appear in the general area he is in, which will make him disappear. You will know you have found him when he disappears, which makes a loud *whoosh* sound. Most likely though you'll unlock the achievement through general play, as I did; if you unlock the entire map you'll get the achievement with certainty.Text solution where he appears
-Balcony above you in the spawn (Easy Street)
-Spawn ritual location, on the roof through the windows (right after ritual)
-Canal district, behind a red curtain, second floor in the Ruby Rabbit building
-Waterfront district, in the warehouse down by the docks
-Waterfront district, on top of the boat by the docks (right after ritual)
-Footlight district, in the Black Lace Burlesque entrance (look through main doors)
-Footlight district, on top of the kiosk outside the Black Lace Burlesque entrance (right after ritual)Video solution
The video I made does not include all locations of the Shadowman but quite a few to get you started and know where he appears. Note: Reports suggest that the New Xbox One experience might cause achievements to not unlock properly, including this one.
If you want to know how to do the rituals, refer over to the solutions written by other friendly TA'ers here: