There are 35 Classified Document in the game, five in each mission (except mission 1 and 9). As always, some of the documents are well hidden, and others are placed in easy spots or part of the story in that mission.
In the spoilers of each mission, you will find the map of the mission and the marked documents (turquoise dot / point), so they should be easy to find. If you have any problems or need help, videos for each mission are also available.
Maps:
I created these maps for myself to find all the collectibles and determine a good path / order for my videos but I think they are good enough to help you here as well. I might create new maps as soon as I have more time. (No guarantee). The documents are marked with a turquoise dot / point.
Mission 2 (Dead Drop)
Mission 3 (Sonderzüge Sabotage)
Mission 4 (Collision Course)
Mission 5 (Devil's Cauldron)
Mission 6 (Assault on Fort Rouge)
Mission 7 (Lock, Stock and Barrels)
Mission 8 (End of the Line)
Videos:
The videos are complete guides for the individual missions, so they show all the collectibles and not just the documents. In the spoiler of the missions you have the video, the timeline of the documents and an overview of the documents in the game, so you can find missed documentsvery quickly. The numbers behind the documents in the timeline match the sorting in the game.
Mission 2 (Dead Drop)*** Spoiler - click to reveal ***03:39 - 06 - Document #1
03:50 - 07-10 - SMG Workbench, Letter #2, Stone Eagle, Document #2
07:49 - 19-21 - Kill List, Letter #4, Document #4
09:04 - 22 - Document #3
09:51 - 23 - Document #5
Classified Documents:
#1 - Findings report
#2 - Orders to follow
#3 - Use the library
#4 - Tightening security
#5 - Increased security
Mission 3 (Sonderzüge Sabotage)*** Spoiler - click to reveal ***02:40 - 07-10 - Rifle Workbench, Document #4, Kill List, Starting Location (Signal Box)
04:54 - 11-13 - Document #2, Letter #2, Document #1
09:58 - 17-19 - Document #3, Stone Eagles
11:26 - 20-21 - Letter #4, Document #5
Classified Documents:
#1 - Gestapo Briefing
#2 - Hotel Refurbishment
#3 - Hotel Storage
#4 - Rail Network Control
#5 - Cargo Details
Mission 4 (Collision Course)*** Spoiler - click to reveal ***01:33 - 05 - Document #4
02:02 - 06-07 - Document #1, Hidden Item #1
03:13 - 09-11 - Stone Eagle, Starting Location (Dam Lookout), Document #5
05:40 - 15-17 - Document #2, Rifle Workbench, Starting Location (Power Station)
08:10 - 21-22 - Document #3, Hidden Item #2
Classified Documents:
#1 - Transfer Details
#2 - Requisition Orders
#3 - Findings Reports
#4 - Requesting Support
#5 - Dam Damage Report
Mission 5 (Devil's Cauldron)*** Spoiler - click to reveal ***02:38 - 05-06 - Letter #2, Document #3
06:10 - 11-14 - Pistol Workbench, Document #1, #5, #4
12:56 - 21-22 - Stone Eagle, Document #2
Classified Documents:
#1 - Scuttle Order
#2 - Wilhelm's Folly
#3 - Classified Cargo
#4 - Intruder Spotted
#5 - Scuttle Instructions
Mission 6 (Assault on Fort Rouge)*** Spoiler - click to reveal ***03:52 - 09-10 - Kill List Target, Document #1
06:53 - 13 - Document #2
09:02 - 17 - Document #3, Optional Objectives
10:46 - 18 - Document #4
12:54 - 20-22 - Rifle Workbench, Document #5, Hidden Item #2
Classified Documents:
#1 - Roof Weakness Found
#2 - Defend Our Skies
#3 - Ready on Your Order
#4 - No Retreat
#5 - Schoene's Notes
Mission 7 (Lock, Stock and Barrels)*** Spoiler - click to reveal ***03:45 - 09 - Document #4
04:29 - 11-12 - Document #3, Pistol Workbench
08:44 - 18-21 - Stone Eagle, Document #1, #2, #5
Classified Documents:
#1 - A Service Hatch
#2 - Control Room Key
#3 - Rocket Fuse Setup
#4 - Hydraulics Concerns
#5 - Vulnerability Found
Mission 8 (End of the Line)*** Spoiler - click to reveal ***00:00 - 01 - Document #2
03:43 - 08-09 - Document #5, SMG Workbench
04:31 - 10 - Document #3
09:45 - 18-19 - Document #4, Stone Eagle
10:44 - 20-22 - Letter #5, Document #1, Rifle Workbench
Classified Documents:
#1 - Zugwerfer Departure
#2 - Prepare to Strike!
#3 - Rusty Turntable
#4 - Railyard Management
#5 - Turret Locations
If you have any questions, just ask. And just in case you like to have everything in one video, here is a video that includes all collectibles. (added also below Target Führer DLC)
All in OneLights, Camera, Achtung - Target Führer DLC