i had a chat with the GM in-game about it, who said he would reset my details and for me to delete my cache.
This didn't work, i also tried logging all my characters on my boyfriends computer to see if this helped but, it didn't.
The GM i spoke to today said he's not sure what else they can try and to make a forum post about it so here i am :]
i have about 20k kills throughout my account, but when i log each character, its just showing their personal kills and the achievement itself its showing up blue like they usually do.
Any help is much appreciated thanks :]