Call of Juarez: The Cartel has a ladder goat movie hidden on the Fort Level, chapter 12. If you successfully retrieve it, you will unlock Ladder Goat achievement or trophy.
Ladder Goat Movie Location
After leaving the tunnels, you will end up inside buildings with enemies out in the small yard area. Take the steps through the double doors and turn right to find a slope.
From the top of the slope, you will see a tree to your left at the top, next to a building. Look for Ladder Goat Movie next to the tree on the ground.
If you still can’t find it, watch the video that follows: