I recently bought the full chronos set and i activated all the items from the chronos set and i checked the achievement for the full chronos set and it sayd "You need to get 17 more items"
Is this a bug

Achievements are bugged, probably you need to wait some days before you can obtain it.

Ok

1 day it takes to update shit.

Just keep the items until you get it.

If you don't get it in a day or so then send me a PM and I'll verify and add the achievement manually for you.

ok