Game: Call of Duty: Ghosts
Trophy: Carbon Faceprint
Mission: Federation Day
Author: CHP

On mission "Federation Day" after you disable the second set of elevators continue down to the floor and eliminate all remaining enemies. After you do so attach you rope to the balcony railing and proceed down. After this don't move but continue to shoot any enemies that appear. After two or three enemies have shown themselves a printer should fall from a window directly above you, don't move and it will hit you in the face and you should be awarded the trophy "Carbon Faceprint - catch the photocopier with your face"