Resurrecting an old thread or not, this still doesn't work for the actual Weekly Jade Vault achievement.
Is it the end of the world? Nah, but a year-old feature still not working is mildly annoying. Yes, I know 25 imperial favor isn't the greatest thing in the world. But if you do the metas and have the statues, you can sell them (only one of them is worth 1 gold) or turn them in. It would be nice to get this fixed.
EDIT: I handed the statues in one at a time and that did complete the weekly achievement. So if you want that extra 25 Imperial Favor, don't select the "have all of them" option. That option still does not complete the weekly ach.
EDIT 2: Well, I spoke too soon. I did the one-at-a-time turn in last week and this week. Of course I get the map bounty chests and I can use the vendor so I know that was successful. However, both of those times (last week, this week) the weekly achievement didn't budge at all from zero.
So, I have a zero % success rate turning them in all 4 at once. I have a 33% success rate doing them one at a time.
Maybe in the next expansion they'll go back and fix this.