Here is the full list of all 11 Nyctophobia achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Explore the Secret Area
Find all notes
Read the writing on the wall
Achieve a score of 250 or greater in Own the Night
Find all notes in Own the Night mode
Defeat all enemies in Own the Night mode
Beat Own the Night
Go camping on the cliffs
Ride in the back of the pickup truck
Beat the Game
Achieve a high score of 600 or greater