I just finished http://www.eternagame.org/game/puzzle/683941/, while in the home page I was in the middle of the way toward the Eterna50 badge. When I finished the puzzle, I suddenly got the Eterna20 badge (http://imgur.com/a/Ymlgd).
I’m not sure weather or not had already seen the message for receiving the badge or not. I also am not sure weather or not I had already solved puzzles in the bots category since the home page had the eterna50 badge in it, as I am pretty sure that the first time it appeared in the homepage the progress bar was already partially filled, and I don’t remember weather or not the Eterna20 badge was in my profile or not before now.