Throughout the chapters there are hidden collectibles. These include research documents, personnel files, torn letter pieces, tracks for the music player and models for the model viewer. Torn Letter pieces are in safes that look like The Keeper's head. Tracks look like a Gold Record with the Tango Gameworks Logo and Models appear as a snail that you must focus your flashlight on until it turns into the Tango Gameworks Logo.
Chapter 1: An Oath
- Personnel File #1: KCPD Criminal Record
After being attacked by Connelly, go down the tunnel to your immediate right to find it on a chair.
- Model #1: Oscar Connelly
After you grab the flashlight, head back towards a sectioned off area. It's on the lower shelf of a table.
- Research Document #1: Entry #231
Follow Shade through the double doors. It's on the ground in front of the corpse.
- Letter Scrap #1
After you escape the first haunted it's on the desk to your right. Press the buttons in the order of the most to the least blood.
- Track #1: Hidden Beginnings
In the hallway after the save point, look at the bottom of the fifth section of wall on the right.
- Letter Scrap #2
Instead of heading down the stairs, turn left and enter the vent. The safe is on the coffee table. The combination numbers are on 3 paintings, the motivational, Modern Art Keeper and the landscape on the left. Use your flashlight to reveal them, pay close attention to the number and color.
- Model #2: Black Cat
After going down the stairs, turn right and enter the vent. The snail is at the far end.
- Research Document #2: Entry #16
After getting past the light puzzle, shine your flashlight on the Mobius symbol to make a desk appear.
On a shelf from where you see Ruvik behind the glass.
- Track #2: Authorization
After being introduced to a new type of enemy called Cadaver, enter the vent the second one came out of.
- Letter Scrap #3
Whiles navigating Biometrics you'll see a cadaver blocking a half open door, which you'll need to crawl under to pull a switch, instead head right and climb up the ladder. To open the safe turn on all the lights.
- Personnel File #2: Recording #1: Recruitment
In the room with the neural scanner, on the desk.
- Letter Scrap #4
The safe is on a desk to your left when you ascend the stairs. The combination is at the far end of the balcony.
- Research Document #3: Entry #229
Left of the double doors after descending the stairs.
Chapter 2: Crossing Paths
- Track #3: Staying Out of Sight
After Killing the Invisible Haunted, go behind the barrier on the far right to find it sitting on a damaged wall.
- Research Document #4: Entry #239
After killing the second invisible haunted it's on a desk in the room with the windows.
- Letter Scrap #5
After fending off Shade climb the ladder to the catwalk where she was. Use your flashlight to reveal the code on the pillar at the far end.
- Letter Scrap #6
Place the fuse on the left most socket of the panel to open the door to your left. Shine your flashlight on the Mobius symbol to reveal a secret tunnel. The combination is on the wall behind you.
- Model #4: Cadaver
After getting the second fuse, a haunted will burst through the nearby door. Kill him with the trap or evade him and go through the door. Crawl under the hole in the wire fence on your left to find it.
- Research Document #5: Entry #246
After getting all 3 fuses and restoring power to the gate, go through the door and it's sitting on a yellow barrel in the corner.
- Track #4: Duel
When you reunite with Joseph turn around and run to far end of the room to find it sitting on the ground.
- Research Document #6: Entry #215
At the top of the staircase shine your light on the Mobius symbol to reveal a door. Solve the puzzle (rotate the piece on the right once) inside by completing the symbol to reveal a secret panel containing the document.
- Personnel File #3: Recording #13: Disposition
It's sitting on the rocking chair around the corner.
- Model #5: Joseph (Haunted)
Behind a wagon is a hole in the wall, crawl under and break some boxes to find it on top of an animal cage.
- Letter Scrap #7
Inside a breakable box near the wrought iron gate. Turn on all the lights to open it.
- Research Document #7: Entry #201
On the end table next to the red sofa.
- Letter Scrap #8:
In the catacombs, the room full of holes, in it's the very last hole on the far end of the room. Same as before, the most blood to the least.
- Track #5: Insubordination
What can be read on the torn letter after all 8 pieces are put together:
``I sensed it in the moment Marcelo triggered the machine.
He had removed my mind from the core. He thought he figured out how to get around me< But he is such a fool. The brain is nothing but matter. My consciousness is omnipresent.
I can see them all: their memories, their thoughts... their fears.
And by pulling in so many people i will consume them all. From the weakest first, each mind gives me more power to counquer.Where does my world end and reality begin? From now on that line begins to blur. ``