Here is the full list of all 20 Paranormal State: Poison Spring achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Complete the main story.
Enter the ritual cave.
Find 20 wolves.
Draw your own map.
Escape the haunted trailer.
Complete the Talking Stick.
Finish a Hidden Object scene in less than 1 minute.
Escape the excavation pit.
Use the EVP recorder.
Finish a total of 10 Hidden Object scenes.
Use the CAM.
Finish a total of 10 minigames.
Discover the Old Zeb.
Escape the basement.
Finish 3 Hidden Object scenes in a row without a hint.
Use the EMF meter.
Finish 3 minigames in a row without skipping.
Finish a minigame without skipping.
Finish a Hidden Object scene in less than 3 minutes.
Finishing a Hidden Object scene without a hint.