Here is the full list of all 15 Kholat trophies - there are 13 bronze, 1 silver and 1 gold.
You've collected a note in the circle area
You've collected a note in the throne area
You've collected a note in the radar station area
You've collected a note in the cave area
You've collected a note in the burned forest area
You've collected a note in the tree area
You've collected a note in the hunters cabin area
You've collected a note in the altar area
You've collected a note in the church area
You've reached the tent
You've unlocked the real ending
You've explored the cave
You've unlocked the incident in the bunker
You've unlocked all safe spots
You've survived!