Seriously Good At This Achievement
Seriously Good At This40
Complete the game on the hardest difficulty setting.You should start the game on Hard, seeing as you have unlimited lives. When you die, you are reborn at a Vita-Chamber and the game stays exactly how you left it, meaning every enemy will have the same amount of health if you were in a battle. You can essentially run at a Big Daddy and melee it until it kills you, then get reborn and return and do the same. It is impossible to get a "Game Over" so to speak, so this difficulty is really not hard at all.