this one will come as you progress through the main story
*** Spoiler - click to reveal ***once you have defeated anokatos (the end boss) you will have to run all the way up. once outside a cutscene starts. after the cutscene *Ding* you will get the achievement.
some helpfull info on defeating the boss:
the boss isn't that hard to beat. even on hard and without that great armor.
the boss does have some patern in his attacks. Avoid getting hit... duh... so keep dodging.
he does some stun attacks. if you get struck by this keep spamming the necessary button shown on the screen.
he will jump on a flooting rock after 25% of health every time. once he does that. keep running around, cause there will be "ghost like" creatures running towards you. you don't have to kill them, they will vanish afterwards.
if you don't have high armor rating the damage may resulted in instant death. Around the third and final time they appear they become insanely fast. You can enter reckoning mode to slow them down.
if that is done, he will jump back. but be carefull, there where he will land (Indicated by a lighting strike) erupts an earthquake. so run away from the marked point.
every "stage" he will do an extra attack. be carefull with these, they could deal heavy damage and are most likely not interruptible. dodging them prevents you from getting hit.
summary:
- get to know his moves, when possible make some chain attacks and than dodge a few
attacks till you know you can get a few good hits.
- any potions are always usefull.
- have lots of health potions + mana potions for mages.
- try to save reckoning for a long as possible.
Thanks to: LORDOFDOOKIE69 for tips and tricks and making this guide possible!