All championships done - achievement not unlocking

I’ve completed all of the championships in the main game. The game statistics page says I have completed all of them. However the achievement progress for that is stuck at 94%.

I believe this is due to the fact that I played some of the campaign offline, when for a short period of time I didn’t have access to the internet at the place I was living. Looks like all of the championships I completed then didn’t count towards the achievement.

Same thing happened with the achievement for getting all the perks.

Anyone had this issue? Is there anyway to fix it? Should I make a post in support forum about this issue?