For the people who are not getting the badge, I think it's unlikely that this problem will be fixed any time soon, so it's best to just click "report acievement" and send a screenshot. I got the badge this way.
@LinkaBR you can open games in a new tab by clicking with the scrolling wheel or right click and then click open in new tab. But it would indeed be better if left click opens in a new tab.
@yeasy, yes full clearing is probably not necessary, but since you need a lot of luck in this game, by clearing everything you can push your luck a little. I have completed the game with several classes in about 30 minutes with clearing everything. And yes, cardinal quest 2 is definitely better.
small guide how I got the hard badge: use fire mage; spending skill points: train focus and fire magic equally until both 8, then only train fire magic until max (20), then spend points on fortitude; get these talents: fire attunement, energy conservation, mental fortitude (in that order). If you happen to find a warrior book you can also try to get toughness, shroomology and stone wall; if you find scroll of enchantment, use it on your staff; kill every enemy you encounter with fireball and regular attacks, be careful not to hit yourself with fireball. Don't forget to heal HP and EP.
"See in-game instructions for details", there are no instructions in-game, how the hell am I supposed to play this game without any explanation at all?
 "Beam Ball"){kind=icon}
 "Epic Boss Fighter"){kind=icon}
 "The Legend of the Golden Robot"){kind=icon}
 "Get Off My Lawn"){kind=icon}
 "Badge Emperor"){kind=icon}
 "Save To Kill"){kind=icon}
 "Sword and Spoon"){kind=icon}
 "Rogue Fable II"){kind=icon}
 "Brute Wars"){kind=icon}
 "Medieval Cop 8 -DeathWish- (Part 1)"){kind=icon}
 "Paladog"){kind=icon}
 "Heavy Weapons"){kind=icon}
 "Accelerator"){kind=icon}
 "Cardinal Quest 2"){kind=icon}
 "Hands of War"){kind=icon}
It's random.