DAA Achievement Question

Today, I finally finished DA Awakening but was unable to do an achievement, a single one, yes. I'm in the room The Mother lurks in and can't return to any of the places as the icons are grey, plus Vigil's keep is destroyed. You can have a look at my proffile if you want to see what achievement I'm talking about. So, because I'm bored to restart Awakening just for a single achievement (*runs*), can someone plz tell me if I can use any commands to unlock it or even now, if I'm able to do it?

Thankz~

Meh...nobody?