Tagger Dabbler Awarded to those who've messed around with the tagging system, enabling themselves and others to make it a little easier to find certain content.
Public Access For successfully posting a user video. You're on the air! Don't waste it!
Speed Runner For showing remarkable feats of gaming skill... or at least being shady enough to steal someone else's and uploading them as your own.
Walking Commercial For providing access to more commercials that don't necessarily suck.
Hey look, it's a totally original dude wearing armor. With a huge gun and a helmet (a visor?). And he's riding a unicorn. This user was granted this magical emblem for not having any of their user profile images hosted on untrusted websites during The Great Purge of March 2013.