To get this achievement, you will need to find the monster in the red maze area of the first level.



Easiest way of doing this is by sending in a wrong report to the conductor.



Immediately after doing so, you'll want to head to the stairs, and left towards the nuhburger poster.



Hopefully you should find the monster that's moving around in the red maze, if not just keep trying until you do (it'll be very obvious when you find him).

Hope this guide helps out those having trouble figuring out this achievement.


Have a great day :)