Ok im proud of you for completing it quicker than me... but i was posting this for people who like me, just needed this last achievement and felt like playing with cheats so it wasnt a challenge. My personal opinion is that it makes you feel more like a super hero as you cant die.
I started a new thread as i couldnt find a one that had information on how long it took to play through on hard.
As for the thread inside of mine, it tells you how to use the cheats and still get the achievements - which is a few years old so i didnt know if it had been patched.
50k - 14/3/13