Weekly store survey just popped up says 6d remaining but keeps saying item is no longer...

No. nothing pops up saying "a update for this game is available. update now!" just that one message keeps popping up.

The survey goes to the appropriate group that verifies the issue. After submitting the survey keep playing and after a while the achievements will pop up.

If what you're talking about is a little pop up box saying something about doing a survey when you're done browsing the site then yes, it is legitimate.

just thought id post back and say iv still not had no email response from that survey i have however managed to get one achievement to pop still awating the one in game of throne to pop though again i filled out the survey at the same time as doing the
other one (did two surveys) and still have had no response

Thats a pain it wasn't there, Id say just keep your eye out incase it pops back up on one of the tiles.