Hey,
I'm trying to get to the achievements in game but it's not working. I should note that I already owned Stellaris on Steam before getting it here.

Exact steps:
- Start the game
- Click on Achievements at the bottom (the little trophy icon)
- Now an ingame windows "Internet Browser" appears with a login form for paradox plaza. I enter my username+password, select "Remember Me" and click "Login"
- Now the browser just says "Cannot POST /login"

Any ideas?

Thanks for your quick help, and sorry for my slow response. I'm not sure I explained myself too well, I wasn't trying to "transfer" my achievements from Steam. In the meantime I also "activated" my games on the paradox webpage, but that displays completely wrong achievements. However I coincidentally found a way to get the achievements to display correctly:

(everything in the main screen ingame)
- open the achievements from the icons in the bottom right
- open the homepage from the icons in the bottom right
- now repeat both steps until it displays them (I get it on the second round)

Using this method it shows me my achievements, correctly. Since this stuff seems to be a bit fragile at the moment I don't wanna risk breaking this funky but working method I have by trying your suggestion though ;)

Cheers