Here is the full list of all 21 Insights - there are Maniac Vortex achievements.
Skip the tutorial
Don't kill the Woman.
Kill the Woman.
Drink one pot of coffee.
Rummage through the garbage.
Leave the forest labyrinth without choosing the wrong path.
Try to dig in the nun.
Leave the minotaur's labyrinth without a mistake.
Finish the game.
Fail your escape attempt.
Build the burger on the first try.
Take a seat.
Inspect every painting in the asylum.
Try to switch the music.
Make the coffee without the water or the coffee cools down.
Finish the forest labyrinth without taking the letter.
Fail 10 times in the burger minigame.
Master every quicktime event on the first try.
Take the pills from the doctor.
Escape the asylum without getting interrupted by the monster.
Collect all pens in the game.