For a comprehensive collectible guide, see my Not A Walkthrough
TM list. It walks you through the entire game, including story-related achievements.
Part 1:
Blair Witch Not A Walkthrough - Part 1 - Beginning to Truck Fuse PuzzlePart 2:
Blair Witch Not A Walkthrough - Part 2 - Truck Fuse Puzzle to Rail TrackPart 3:
Blair Witch Not A Walkthrough - Part 3 - Rail Track to Third CampsitePart 4:
Blair Witch Not A Walkthrough - Part 4 - Third Campsite to FinaleAlthough there is no chapter select, once you've found a photo, you don't need to find it again (although it will still exist in your game world). When going for collectibles, I suggest using strategic save points (at the tree, after solving the sawmill camp puzzle, after the fog, etc.) That way you don't have to play through the whole game again. However, there is no list where you can see all the ones that you've found.
As noted in the comments (and suggested by the game itself), using headphones greatly helps in finding items and navigating the game. It especially helps with finding totems, which is where the bulk of the photos are. So use headphones and enjoy the side benefit of having the crap scared out of you.
There are some minor spoilers.
HUGE thanks to everyone in the comments and the forums for helping complete this.
Prologue*** Spoiler - click to reveal ****Peter - hood of car
*Arcadius R. - hood of different car
Fence is a point of no return (still considered Prologue)
*Marius G. - After the fence, on the way in, JUST past the ditch on the path, before you drop down the rock, right around when you learn how to call Bullet, there's a less obvious path to the left. The photo is that way.
*Alexandra - Back on the main path, stay on the right paths, this is in the middle of a fork.
Following Bullet after he gets the cap will make you drop down. This is a point of no return.
Chapter 2 - Off the Beaten Path (there is no "chapter 1")
*** Spoiler - click to reveal ****Matthias K. - IMPORTANT! This is in the trenches before you follow Bullet. It's on the ground next to a medium-sized fallen branch that is blocking one of the small "alcoves." You should find it easier if you start by going left around from where you land. (I found it before I passed out.)
Picking up the camcorder is a point of no return.
Chapter 3 - The Abandoned Camp*** Spoiler - click to reveal ****Hubert - In the campsite, up the hill to the right of the camcorder, then up the steps on the right. You can also get this in Chapter 2 before you use the camcorder.
*Olga - Totem above the path. Bullet takes you past this after he gets the toy car.
After you find the car and follow Bullet, going down the rocks is a point of no return.
Chapter 4 - Into the Darkness*** Spoiler - click to reveal ****Arthur - Totem - After you go down the rocks and get the call from the Sheriff, keep following Bullet. He will get spooked by the totem.
Chapter 4 - The White Tree - Starts at White Tree
Chapter 4 - The Rust Bucket - Begins when finding rusted truck
*Thomas - This can be annoying. Look at the White Tree with the bunker on your left. Go right toward a wall, the ask Bullet to dig. In my case, he dug it up without me asking. The photo is underground, and cannot be found without Bullet.
*Matthias G. - This is hard to explain. It's on a totem that's on a white-painted rock in the woods. Followed the path from the White Tree to the rusted truck, then go straight for a short bit, then left into the woods. Bullet started growling when we were near it.
*Michael B. - This may be the most annoying photo in the game. Many thanks to Leebbullough for the video clip that helped me. Start at the broken rail car that you find. Follow the video below. The photo is in a tree. https://gamerdvr.com/gamer/sashamorning/video/78816235
Chapter 4 - The Reunion - Starts after finding destroyed bridge
Chapter 4 - Light the Fuse - After conversation with Voice on walkie-talkie
Fixing the fuse is a point of no return
Chapter 4 - The Stream - After switching to day, when Jess texts
*Barbara M. - cross river, left, under fallen tree on ground
Chapter 5 - The Loss (Starts just past the last photo)*** Spoiler - click to reveal ****Aneta - next to Lanning
*Caroline - after leaving Lanning, you'll walk down the trail to a small pond where you have to go right because of a branch. Right here, on the left, the photo is on a stone.
*Matthew S. - you'll come across some stairs on your right. To the right of that is a small pond. There is a totem on a post on the far side. This is in the totem.
Crossing the dead stream is a point of no return.
Chapter 6 - The Hollows
Chapter 7 - The Second Campsite*** Spoiler - click to reveal ****Marius S - Totem, in the campsite by the tree
*Mara - Up hill on right of the tent in the garbage pile
*Carl - Near burial site, up the hill to the left of the large tree
Once Bullet starts following the scent, you will reach a point of no return.
There are two during the battle sequence. Both are on sandy areas that are NOT burning. This area is disorienting. Remember that the sandy areas are safe from enemies.
*Lucas P. - Near the beginning, there is a VERY big log sticking out across the field on the right. From this, look right and you'll see a fire. The correct island is further to the right. The photo is on a stone on the other side.
*Bart - On a crate on the right side of one of the sandy safe zones. I remember hearing "enemy fire" right before I got here.
After the cutscene, you'll reach...
Chapter 8 - Into the Battlefield*** Spoiler - click to reveal ****Przemyslaw - Just after starting down the path, tell Bullet to seek. He should find this photo on the right hill. (If he doesn't, try a little further up.)
*Casper - On the track, just before the railroad bridge, on a stump on the right
Chapter 8 - The Cart - When you find, well, the cart
Chapter 8 - The Crossroads - Just before Camp A
*Arcadius P. - right side of Camp A shed
Chapter 8 - The Maintenance Shed
*Sergius - Barrel on right of Maintenance Shed
Chapter 8 - Camp B
*Jack - Next to broken donkey at Camp B, on a broken log cart
*Katherine - Leave Camp B toward the rail bridge. The photo is just before the bridge on a post on the left
Riding the cart past Camp A is a point of no return.
Chapter 9 - The Sea of Monsters*** Spoiler - click to reveal ***Chapter 9 - Burned Bridges
*Andrew - When the trolley breaks down, go toward the bridge. The photo is on the right before you reach the bridge. This is right next to the Wine Bottle trash.
Chapter 10 - Tappy East Creek
Chapter 11- The Sawmill *** Spoiler - click to reveal ****Raphael - Sawmill, left building on table
*Barbara K. - Sawmill, right building, locked door, right drawer
Going upstairs into the sawmill is a point of no return.
Chapter 12 - The Third Campsite*** Spoiler - click to reveal ****Patrick - By the campfire
*Richard - Look at tent, turn left and go straight ahead (not up the hill). The path will bend left at the water. The photo is on a dead log on the left. If you get to the bear trap, you've gone about twice as far as you needed to.
*Martin - Go up hill left of tent, follow the stairs on the right, as they bend to the left, photo is on a mossy rock on the right
Dropping down the rocks toward the White Tree is a point of no return.
Chapter 13 - Into the Fog*** Spoiler - click to reveal ****Bart S. - Follow the directions to the tree. When you get near the tree, you'll see a rock with white paint. Instead of turning right to the tree, continue straight. The totem is on a stone.
Chapter 13 - Trial of the Tree - at the White Tree
Chapter 13 - The Gun Shot
*Michael M. - Follow the trail from the tree. Carver will start singing. Badly. You'll pass a helicopter and go under a road sign. Just after the sign, you'll see trees with white paint on them (not on your screen). Just after the 4th tree, the totem is hanging from a tree.
Chapter 13 - Trial of Skin
Chapter 13 - Trial of Knife
Chapter 14 - The Tragedy
Chapter 15 - The Twisted Maze
Chapter 16 - The Fourth Campsite
Chapter 17 - The Cabin in the Woods*** Spoiler - click to reveal ****Matthew L. - Totem, after Carver says "I like the quiet."
*Conrad - When you need to go upstairs to deal with the robbery, this is at the bottom of the stairs.
*Paul N. - Totem, after the water sequence
These last four may or may not count, but they are directly along the story path:
Squad photo
Photo of a Door - on tarp, unmissable
Photo of a Room - After Witch and corner
Photo of a Woman