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