Ah, all right. Misunderstood you a bit there.
Well, if you are in a group, you can set Carbonite up to alert Party Chat that you've completed an objective ([Party] Jigain says: Shaman slain: 10/10), so I figure that shouldn't be too hard to adapt to be said as a player-only chat message, much like the Carbonite loading messages and the quest complete message.