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