Barry isn't connected to any spirit, because he isn't a mage. The magic he's been able to cast so far was done through the aid of the stat device, not through his own power. You can also be a 'mage' and not be linked to a spirit if you were never an actual mage and only became one because your aura was altered, like in the case of Kate, Melindra, Diane, and Diane's brother.
Yes, but the achievements for book 2 will be revealed after the book is finished. There will be a contest to see who can get all the achievements completed the fastest, on android, where there are leaderboards.