Here is the full list of all 40 Fix Me Up Doc! – Dark Humor achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Find that badass cat
Heal 15 patients
Replace the ninja`s brain with a boxing glove, the stomach with a hedgehog and the elbow with a toast and complete the level with 3 stars
Replace the musucian`s knee with face and complete the level
Replace jaws with fences
Pour ketchup in at the last HP
Flawless operation on second patient
Flawless operation on seventh patient
Flawless operation on fourth patient
Flawless operation on sixth patient
Collect all stars in the game
Get 3 stars at three levels in a row
Heal ninth patient
Flawless operation on ninth patient
Cut a patient to death with a knife
Heal eighth patient
Flawless operation on eighth patient
Restart the same level three times
Replace the heart with an octopus and complete the level
Heal seventh patient
Finish a level when it`s only few HP left
Heal sixth patient
Put the hobbit-mermaid hobo instead of the punk`s arm
Flawless operation on fifth patient
Heal fifth patient
Make your first tattoo
Make a pirate tattoo
Put different bones into the designer`s arms
Heal fourth patient
Never miss a toothpick at a level with bugs
Flawless operation on third patient
Heal third patient
Restore health with a ketchup
Make the pretty guy unpretty
Heal second patients
Make a photo of a patient
Heal first patient
Flawless operation on first patient
Get inside a patient
Scare the Running Guy