The MegaCorp Add-on for Stellaris has 7 achievements.
As a Corporate empire, have a branch office on 5 different empires' capitals
I won the Galatron and all I got was this lousy achievement
Build a Mega-Art Installation in a nebula system
Build a Matter Decompressor
Build a Strategic Coordination Center
Build an Interstellar Assembly
Capture the Galatron from another empire