i guarantee everyone complaining about the difficulty and how cheap it is are trying to play the game on superhero to start. this game is simple as hell you just have to do two playthroughs through most of the game to get your characters leveled up. honestly its not that hard.
i am on the silver samurai level and i am now playing on the hardest difficulty for the rest of the game because my characters are leveled pretty high now.
Easy 1000 I would say that can be done in about 6-8 hours.
Always looking for the next achievement... hit me up.