Chapter 9: Those Who Prove Worthy
Shortly after the start of chapter 9 you will come to a room with a puzzle. There's a big wheel with a switch to the left. Activate the switch to get a water bucket. Fill it with water and bring it back to the wheel. Now the part for the trophy starts. You may only rotate the wheels 10 times to complete the puzzle.
The puzzle is randomized, it's different on each playthrough regardless of difficulty settings. So it's impossible to give detailed instructions. I was able to complete mine in 6 moves because I got a lucky starting combination, but yours will likely be different.
The final picture has to look like this: White corss on left, big cross in the middle, black cross on the right, water bucket in middle of top wheel.
Just try around and restart the checkpoint when you know the solution for your puzzle.