Starting with the first time you get off the boat in the Sewers until you run under the closing door, don’t use the light (
) to kill Zurks. You are allowed to use the environment and to shake them off (
). In the first encounter, make sure you run in, flip the switch, and wait on the barrels until the boat arrives.
Then in the large room with a switch and two doors, run in flip the switch, shake off any Zurks, then circle around the left side. When you reach the next tunnel with platforms in the middle, jump to the platforms after most of the Zurks drop off. After the platforms, hug the right wall up the ramp then zig-zag down the remainder of the corridor.
Next, in the room with 2 hackable panels, start the hack on the right panel and immediately turn around and start backtracking. Jump between segments to put some distance between you and the Zurks and keep to the right side when approaching the left panel.
In the final chase sequence, move left/right down the initial tunnel. Then, use the walkways to lure the Zurks in one direction, while running the other way. Alternate paths when available. Once you reach the closing door, the trophy will unlock.
This video shows the full path taken in the Sewers to earn the Pacifist trophy while grabbing the 3 collectibles in the chapter.