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 collected a note in the altar area.
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 church area.
You've reached the tent.
You've encountered the anomaly.
You've unlocked the real ending.
You've lost the chase.
You've collected all reports.
You've collected all articles.
You've collected all journal pages.
You've explored the cave.
You've unlocked the incident in the bunker.
You've unlocked all safe spots.
You've survived!