The video above is the The Order 1886 Chapter 15 Collectibles Locations Guide and shows the locations of all collectibles in To Save a Life, the mission featured in The Order 1886.
There are 63 collectibles that can be found in The Order: 1886 videogame, divided into the following categories:
16 Phonograph Cylinders
10 Newspapers
16 Documents
11 Photographs
10 Objects
