Question about the campaign ending

I'm fairly new to this game, only have about 15 clears so far. >!I just brought Persephone back to the Underworld and everything seems to be better.!< I was just wondering if there is still anything left to the story itself or if all I'm doing now is finishing achievements and upgrading everything. I love this game and I'm gonna continue playing it, just curious on if the story continues afterwards. Thank you for any replies.