The Grand Archive Add-on for Stellaris has 7 achievements.
Fill any Collection category with active Exhibits.
Build each type of Voidlure in one game, and attract each type of eligible Space Fauna.
Reach 50 Vivarium capacity.
Destroy a Voidworm nest.
Capture a Cutholoid with a Gravity Snare.
Discover Captain Ness's Treasure Hoard.
Defeat the endgame crisis without building a single artificial military ship.