Here is the full list of all 10 MORTEM achievements.
Found her 10 times and survived!
Survived Wind Wind Wind!
Survived Power Out!
Survived Peek a boo!
Completed the game!
Survive Hide and Seek in Nightmare Mode!
Survive Wind Wind Wind in Nightmare Mode!
Survive Power Out in Nightmare Mode!
Survive Peek a boo in Nightmare Mode!
Complete the game and the bonus levels!