Xrystal (which I keep wanting to say Crystal) has an addon that moves the DEFAULT WOW Achievement/Quest watch window to the bottom right msg box of nUI.....
SCroll Watch Frame by Xrystal
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Have fun, and remember WOW is just a game, for us to enjoy, and all the Addons we use.... remember the programmer is a human too, and MOST times, is doing this as a hobby, so give them time to have their life, so they can fix the addons, so we can have our WOW life.