The Supremacy Add-on for Endless Space 2 - Digital Deluxe Edition has 10 achievements.
Win as the Hisshos
Complete the Hissho faction lore quest
Have the 4 honorable actions active at once
As a Hissho, destroy at least 20 CP in less than one phase of space battle
Win with the Hissho without having ever been under 50% Keii
Own 1 Obliterator, 1 Juggernaut and 1 Citadel at once
Fire one single Obliterator twice in the same turn
Win a game without ever capturing a system after a successful ground battle
Use a Behemoth to reassemble all the planets in a system destroyed by an Obliterator or Core cracker
Destroy an enemy Behemoth with a fleet containing a Juggernaut