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.
Unlock all Blood Vials.
Defeat the former ruler of all.
Finish the game on His day of rest.
Collect all 18 Chickens.
Defeat Satan.
Be halfway in finding all chickens.
Create a Satanic Star.
Defeat a former ally.
Defeat Maggy.
Defeat Pork Chop.
Go to Hell. Literally.