Complete the tutorial level.The basic thing to remember is to use
to evade often if you're going for the Hard mode trophy.
The troll towards the end is the "hardest" part. Although the entire level is easy as even on hard, as long as you avoid damage everything goes down pretty easily. Also, if you do muck up, the game is generous with health potions early on, so take advantage of that.
Once you've got out of the well abd see daylight for the first time, the trophy pops.