The achievement was added later in the day on the first day so I know a bunch of people said that the first day didn't register. But Ariel did say that if need be at the end you can file a ticket and they have logs of when people went and can update the achievement then!

Well I think there is one achievement for 25 days and then one for the whole month so it might be good to get it updated at the end anyway. But since this will be a ticket issue, I am going to go ahead and lock this up!