Like, Game Badges. Example: 5 games played = bronze 10 games played = silver an so on.. And like this, On aparticular game like sonny.. 5 units killed = bronze 100 units killed = silver 200 units killed = gold and so on.
Please do refer to the AG3 section and the lists with things being implemented before making a suggestion in this section. Or, perhaps, go read the stickies, and find the common suggestions, and see it has been suggested more than 9000 times.