Here is the full list of all 20 Kholat achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
You've explored the cave.
You've collected a note in the cave area.
You've collected a note in the altar area.
You've lost the chase.
You've encountered the anomaly.
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 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 church area.
You've reached the tent.
You've unlocked the real ending.
You've collected all reports.
You've collected all articles.
You've collected all journal pages.
You've unlocked the incident in the bunker.
You've unlocked all safe spots.
You've survived!