With the introduction of Accountwide Achivements you don't really care, who was the first character you got an achievement with?
Then ExoY's Achievement Anonymizer is what you are looking for!
It will hide all instances within the achievement tab which states: "Earned by...."
It will work for any languages but the menu is only available in english at the moment.
If you looking for a little more considerate approach, check out Honestly-Earned Achievements
As a little gimmick you can also put there a little text of your own choosing with customizable color.
Dependencies: LibAddonMenu-2.0, LibExoYsUtilities
Version 2
+ api bump to U40
+ added LibExoYsUtiltites as dependency
+ removed pointless options
+ minor code improvements
I just came back to the game (i quit just after blackwood) and i was so bothered with this! Maybe i'm just weird but i can't beleive there isn't more people downloading this! <3