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