I know there's a DLC for the game, but I can't find it on Steam anywhere. Is it available? Was it removed?

Finished the game, and playing in the free mode. Only three achievements left to go, but something is wrong. I've scanned over 550 stars, and the Super Star Scanner achievement hasn't shown up. I'm certain that I've met the conditions for "So close, yet so far" as well. Do these achievements only happen in Normal mode, or is there something else going on?...

Hallo. I got exactly 575 stars/planets/etc... but I did not get the achivement for the 500 stars. Anybody? I did everything but still want those two achievements (500 and 1000) but do not want to do it for nothing because in game the accounts seems lost o_O. Maybe only counts the stars in story mode? IDK....

dawned on me after 2 hours with zero achievements. Playing "normal" not story mode, it this making the difference?

The last update was said to add German and Korean to OPUS. Did the devs forget to make the update public? Because I just can't find a way to enable German: If I go the route Library > OPUS > Properties > Languages, German isn't in that list (and funnily enough, neither is Korean - it's got English, French, Chinese, Japanese and Portuguese). If I start the game, there is no language option in the start menu. Or is there a different way to enable that language?...