Here is the full list of all 11 Bloody Hell achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Finish the game on His day of rest.
Collect all 18 Chickens.
Unlock all Blood Vials.
Create a Satanic Star.
Be halfway in finding all chickens.
Defeat the former ruler of all.
Defeat a former ally.
Defeat Satan.
Defeat Maggy.
Defeat Pork Chop.
Go to Hell. Literally.