How many times have you 100% explored a map, finished a dungeon or completed some other great achievement only to be rewarded medium armor to a warrior or heavy armor to a mesmer, that is useless.
It wouldn’t be hard for Arenanet to reward player achievements automatically designed to suit the class of the character who made the achievement.
I hear many a complaining about recieving useless loot for a different class to their character, and something that could be fixed relatively easily?.
Just my suggestion.