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