Those items are collectibles-secrets.
Our walkthrough indicates the exact location of each artifact and pendant.
The slip of paper should be right next to it.
It is lying on the ground next to the wall on the right.
You will find the artifact next to the lamp.
Do not enter it yet and go to the right.
You will see several trees there and a pendant on one of them.
Shoot it down and pick it up.
At its right-hand end, there is a staircase and a corpse on the landing.
Next to the man, there is the next slip of paper.
There is a corpse of a soldier on the stairs with the next artifact next to it.
Go to the shop at the left-hand end of the location and search the drawer behind the counter.
Inside, you will find the pamphlet.
This way, you will reach a room with the collapsed floor.
Stand on the top of the slant and jump onto the ledge of the wall to the left.
As you walk over the narrow passage, you will reach a cabinet with the next pendant in it.
After it ends, go straight ahead until you go down the stairs.
To your right, you should notice a corpse with the artifact next to.
Cross the lake to reach the structure with pillars.
Inside the structure, there is another pendant under the water.
Remember that to stand among the pillars, you better pressX.

To the right, you should notice a ladder.
Opposite the ladder there is the note (right next to your companion).
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