ok, for all of you trying to figure out how to beat the game and get the last achievement here it is. after getting the last heartstone piece, go to the alliance or shadow runner camp to the northeast of the red castle. once u get that quest, go as far east as u can go and then as far south as you can go to find the final boss
 "Curl Up and Fly!"){kind=icon}
 "Take Something Literally"){kind=icon}
 "Hands of War"){kind=icon}
 "Use Boxmen"){kind=icon}