Update achievements retroactively

Hey folks I've noticed that my last played date is listed as the date I joined the site. It'd be nice if the achievement data (timestamps) was imported and updated based on that information opposed to the join date of the site.

it usually takes a couple weeks to sync all your achievements depending on how high your gamerscore is so give it time they will show

Your achievements have nothing to do with your join date. They're updated retroactively based on the date and time you unlocked the achievement — even if you unlocked an achievement prior to joining Gamertag Nation. I hope that helps. Let me know if you have any questions.