I see that most of you actually did get the achievement. It was probably just a cache thing. It needed a bit to update and award the achievement. I just had a bunch of users test it and they all got the achievement. Is everyone good to go?

Are you sure you didn't already have it? Can you post a screenshot with it unmarked? I cannot see yours for some reason.

Thank you for your patience. I am trying to see what we can do about this :D

You should have it now!

Ok guys, I am going to close this as resolved. If you did not get it (and you have waited to make sure the cache updates), please file a ticket and a UA will help you look into it.