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 survived!
You've unlocked the real ending.
You've collected all reports.
You've collected all articles.
You've collected all journal pages.
You've explored the cave.
You've encountered the anomaly.
You've reached the tent.
You've unlocked all safe spots.
You've collected a note in the burned forest area.
You've collected a note in the throne area.
You've collected a note in the cave area.
You've collected a note in the radar station area.
You've unlocked the incident in the bunker.
You've lost the chase.
You've collected a note in the church area.
You've collected a note in the altar area.
You've collected a note in the hunters cabin area.
You've collected a note in the tree area.
You've collected a note in the circle area.