To get a medal of any kind it involves major commitment (not so much for PC users...) and spending quite a lot of time on a spot. Adding images, Articles, Picks, Forums, 動画 and リンク is the way to go - adding コメント doesn't help but is a good way to get yourself known so people take and read your 記事 and フォーラム もっと見る seriously and take もっと見る of a look and rate higher. After you've added loads and loads and loads of these and they have been rated によって other users, it's just a matter of patience before あなた get a medal. Just keep on adding the content and eventually the メダル will come :D
The problem is that nobody knows how!!! But for sure あなた have to contribute smth to that spot! <It works better with pictures (photos/wallpapers), for example I uploaded some 50 壁紙 and I've got it (for Twilight),easy isn't it? But for other spots あなた may be working hard and あなた get just nothing! This is the sistem and we have to accept it !