December 2014 - last edited December 2014
December 2014
best thing to do is save before you beat the last dragon and then go to that save to kill a dragon again. The achievement might pop up then.
if you have a save that has you at below 10 dragons killed, I would go to that save and kill a dragon to see if it pops up. If not then you'll have to go to another playthrough to get it.
It's probably the Ferelden Frostback that's glitched (this one is the one that didn't count for me) so if you do another playthrough, focus on killing this dragon first because more than likely the achievement will pop up then.
December 2014