I got the 50k and the 100k kill achievement one the same day, 50k in one day isn't that hard.
Armory is in beta after all, and after 3-4 years with armory it still can't tell the time and date..

I can't access armory atm, but if you want to check: http://eu.wowarmory.com/character-sh...elstrom&n=Puro