Something to show off atziri kill on character ?

I am just curious if you could somehow make it possible to display the ''this character has killed atziri''

Possibly with a small icon on the character's icon ?
One important thing to note is that it shall be on the character NOT the account !

I think it would be awesome to see this and think, i started this char with rugs and shit and i killed the megaboss. Also imagine the respect toward those in HC leagues having that !

PS : this is not a show-off ''yeah i killed atziri on standard'' (did it some months ago i just had the idea now)