The Shadows of the Shroud Add-on for Stellaris has 7 achievements.
Form a Covenant with any Patron
Discover every available minor and major Patron in a single game
Destroy the galaxy with the Aura of the End
Gain a Covenant Power from each Patron when forging your own path
Unlock every Psionic Ship Component
While playing with the Secret Societies Civic, have 5 or more empires in a Proxy War simultaneously
Lose >999 Pops when completing the Experimental Testing Situation