Its directly related to the activity app and not the watch. My watch is still giving me move streak achievements, but they are not awarded in activity because it think its 500 days later than what it is. There is no other logical reason as to why my activity app (and 4 others) thinks its 500 days in the future.
ah its iOS related then. hope there is a fix in 11.2.5 that has not been mentioned. i got the badge for new years back in december.