So i beat Dead Space 2 yesterday (Fucking awesome game) and i started to replay it again today, with the new game+ feature. I put it on Zealot before going to hardcore, but after a while i was wondering, "is it really this easy?" as i was just stomping the necromorphs and almost oneshotting them. Then when saving somewhere in the first chapter, i find out its on normal difficulty. 
 
so my question is, does anyone know if i change the difficulty setting to Zealot, will i be able to get the achievement for beating it on zealot, or does it have to be a clean start to unlock it? anyone who has a similiar problem who can shine some light on this?

I would assume a clean start like most games and besides you're only on the first chapter anyway.

Clean start. Otherwise you would be able to change it at the end from normal --> zealot, and still unlock an achievement.

Not the same problem really. But I had the same thought about it being easy, then I checked to see if I picked the correct difficulty, and luckily I did. The game is still easy on Zealot.

I'd say go balls deep and try it on Hardcore. Don't waste your time on normal, especially if you already beat it on normal. It would probably be tough but the satisfaction will be immense!

I'd then start a normal game on zealot, as this well be more reminiscent of how hardcore will be (because you can't NG+ straight into hardcore) and get a feel for the difficulty.  "