Achievements are bound to your account, so you won't loose them. Just the "Earned by" line will be blank.
No idea about the motif.
I wanted to add a clarification. The character must have logged into the game after Update 33 for the achievements on that character to be transferred to the account. Yeah, not a big concern as time marches forward, but it can still be an issue on dormant accounts or characters.
UntilValhalla13 wrote: »I would assume that the name would stay there regardless. I have potions crafted by deleted characters, and it still has their name on the CRAFTED BY part.