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