Just wondering if I install some mods will it make it so I can't earn Achievements. Anyone tested this?

On Steam achievements are disabled if you play with mods.
I too would like to know if the same applies to Galaxy. I desperately want to install this mod, but I'm afraid that it might disable galaxy achievements :(

On the Nexus, it's clear as they say often that any mod will disable achievements. However, I'm not positive about the mods that you put in your data folder instead of the mods folder ... but I never get those ones anyway, no matter how much I might want it - hard to revert back if you end up not liking it or it's buggy. I had to completely reinstall a different game awhile back because of that and swore I'd never do it again.


Ps: What are achievements and why are they important? I'm being serious, never used steam or any consoles in recent times.