This is actually easy.
I suggest you to try this on Easy after your 1st run on Normal or Easy and a second one for New Game +, after beating the game on NG+ which is actually harder than hard difficult you will notice this is a piece of cake, as easy difficult is not challenging at all.
If by any reason you die, simply close the game and return.
You can check your deaths over the Abilities menu, pressing RB to jump to 'summary' tab.
This attempt will take you around 2 hours.