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.
Heal 15 patients
Replace the musucian`s knee with face and complete the level
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
Find that badass cat
Flawless operation on fourth patient
Flawless operation on eighth patient
Flawless operation on fifth patient
Flawless operation on sixth patient
Put the hobbit-mermaid hobo instead of the punk`s arm
Flawless operation on second patient
Flawless operation on first patient
Collect all stars in the game
Heal ninth patient
Flawless operation on ninth patient
Heal eighth patient
Replace jaws with fences
Cut a patient to death with a knife
Scare the Running Guy
Replace the heart with an octopus and complete the level
Flawless operation on seventh patient
Heal seventh patient
Finish a level when it`s only few HP left
Heal sixth patient
Get 3 stars at three levels in a row
Restart the same level three times
Make a pirate tattoo
Heal fifth patient
Make your first tattoo
Pour ketchup in at the last HP
Put different bones into the designer`s arms
Heal fourth patient
Never miss a toothpick at a level with bugs
Heal third patient
Flawless operation on third patient
Restore health with a ketchup
Make the pretty guy unpretty
Heal second patients
Make a photo of a patient
Heal first patient
Get inside a patient