Here is the full list of all 24 Sanitarium Rush achievements.
The fear of the unknown
The fear of long words
The fear of blood
The fear of abandonment
The fear of needles
The fear of birds
The fear of death
Mental Disease
The fear of holes
The fear of flying
The fear of germs
The fear of small spaces
The fear of thunder/lightning
The fear of dogs
The fear of open or crowded spaces
The fear of heights
The fear of snakes
The fear of spiders
The fear of cats
The fear of balloons
The fear of ghosts
The fear of mirrors
The fear of love
Dream and you will be free