I've been playing this game on hard for 40 hours now, and no single achievements has been unlocked.

When i first started the game, i was messing on the menu screens and even tried to change the difficulty to see what the different was. But as soon as the game advised me that changin the difficulty to a lower setting would prevent achievements to unlock, i've denied it and stayed on hard.
But no achievement has been unlocked so far. Is it a bug with the galaxy? Or maybe when i tried to change de difficulty, it locked everything, even tough i canceled the action?

Anyone with the same issue?

I've been unlocking achivements normally playing via Galaxy.

There is no pop-up in game, but besides that it seems to work ok.

Not for me. I guess it has something to do with the fact that i tried to change the difficulty, even tough i didnt change.

http://i.imgur.com/Zrsc4Hv.jpg

Changing the difficulty only prevents you from getting the achievements that require you to finish the game on a certain difficulty - at least that's what the message you mentioned says.

Must be a bug.