Create yourself a Hub View of attachments.
To do so, open Hub app, swipe from left or press on three bars on top left.
Scroll to the bottom, "Settings". Then scroll again to the bottom, "Add View".
Then select all accounts that attachments come from.
MOST IMPORTANTLY!!!!! : Filter on the bottom with "Attachments".
Filters also work for unread so create yourself an unread view and have fun with your hub!
Posted from my BlackBerry Priv