Why on earth are you bothered about grinding your character to level 60?????
Theirs no achievement beyond level 50 and by getting to level 50 I had to do a thorough playthrough completing every side quest in the game and then playing a lot of the bloodbath arena. Once I'd done this I was done. Unless you absolutely love this game your gonna have to repeat loads of stuff and for what. The enemies level up with you so it's not like your some super hard badass at level 60.
People think it's an obsession. A compulsion. As if there were an irresistible impulse to act. It's never been like that. I chose this life. I know what I'm doing. And on any given day, I could stop doing it. Today, however, isn't that day. And tomorrow won't be either.