Here is the full list of all 13 Haunting Hour achievements.
Complete the game in under 50 minutes.
Complete the game in under 40 minutes.
Complete the game in under 30 minutes.
Complete Guiding Light solo.
Collide with a mansion ghost.
Finish the game without having the Butler clean up after you.
Attempt to leave through the front door before the ritual is done.
Complete the game without wearing a costume.
Enter the game as Ghost Ghost.
Find the hidden message.
Create 3 different recipes in the cauldron.
Read every book in the game.
Don't make the Skeleton puke.