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