hard difficulty done in one sitting???

[alkazon]

do u have to beat the game in one sitting on hard to get the achievement for beating all acts on hard??? i know for other achievements u have to, but i was just wondering for that achievement

[Leviathan1348]

I don´t know if i got you right, but you can save and return to your game later. I played the hard champaign over 3-4 days, so you are not forced to play from the first to the last chapter in one sitting.