Do you feel the need to get holiday/event achievements on multiple characters? I've got plenty of friends who have to log on every single one of their 80's (and sometimes lower level characters as well) to get every single holiday/event achievement. Personally, I'm the type of person that designates one character (my warrior) to getting all those achievements. To me, it's enough of a pain in the butt to beat the RNG boss on one character, much less on multiple characters.
How about you?