1: When you first arrive in the area, drop down to the street and immediately on the right will be this memorial.
2: When you first arrive in the area, drop down to the street and in the back alley below where you jumped from will be this memorial.
3: Just after you run into the "Hooded Man", defeat the few enemies and then go back down the street to find this to the right of the tunnel.
4: When you climb the fire escape and enter the first building, go all the way to the top level and then drop down to the floor to find this against the far wall.
5: When you are crossing the walkway from the first building during the Hooded Man chapter and it collapses, run to the end of the street to find this memorial there.
6: After you have defeated Abaddon, go through the open doorway and make a left. Go past the power switch and around the corner will be this memorial.
7: When you are climbing the church to enter the hole in the roof, drop down just after you climb up the wires where this memorial will be on the right and side.
8: When you enter the ground hatch on your way to find the second acolyte, you will run into three guards. Go to the right side of the room and drop down through the grate in the floor to find this memorial there.
9: After you use the fans to the right of the map room to lift yourself up into the library, use the Demonic Wings to double jump to the second floor and go around to the far side. Across the balcony on the right side, directly above where you entered, will be this memorial.