Chapter 8 Encounter:
You must get to the gate on the other end of the graveyard without getting seen (yellow), and without killing. If detected, just restart the checkpoint or encounter. The best way to do this is to climb around the cliff area nearest the beginning of the encounter. Watch out for the guard inspecting the cliff side. After he leaves, follow him to the top of the hill, but watch out for guards. From here, make sure you are always hiding in tall grass! Just sneak from grass to grass until the enemies give you a small opening so you can climb the face of the structure nearest the gate, and quickly move along the ledge to the corner nearest the door. When nobody is looking, climb up and open to the gate to unlock the trophy.