What's the matter with the achievements?! Apparently they seem to be integrated, just not working oO anything to do with the "you use mods so no achievements" pop up at gamestart?!

I have the same problem!
Installed several times, but with every new game, the message comes up that mods are installed, and achievements are therefore blocked.
I have no clue whats the cause of this.

I'm having the same problem. Playing the game for the first time and achievements are disabled. Uninstalled/reinstalled, did a verify/repair, and uninstalled Skyrim. Not sure why it thinks I have mods installed.

There is a serious defect with the achievement list here. It is clear that achievements are not popping because every single achievement in the game has been obtained by 0% of players.

hey,
sorry for the super late answer to you guys, but achievements aren't enabled in the GOG build
(due to technical difficulties), they shouldn't pop up at all.
we don't know why they do :/

Yep, Gog.com have now blocked access to the achievement list