Here is the full list of all 18 Interactive Horror Stories achievements.
Be a good mom to Lisa
You summoned something and it killed your child
You summoned something and you need to exorcise it
Don't buy the board
Be free
Become a clown
Killing yourself with the sword of Alexander the Great
Killing yourself by jumping from the window
Don't buy the skull
Start of a new life
...
A lame ending
The king is dead, long live the KING!
Resurrect "Jonathan"
Learn what happened to other babies
Get killed by Lisa