The Overlord Add-on for Stellaris has 11 achievements.
Have a network of at least 30 Hyper Relays, in systems you own, connected to your capital.
Catapult a military fleet directly into the capital system of an enemy empire you are at war with.
Have a Fortress World with a Planetary Defense Shield, protected by a fully upgraded orbital ring, filled with defensive modules, with a fleet power of at least 10,000
Have a tier 3 subject of each Specialist type simultaneously.
Modify a vassalization contract.
Be the patron of three maximum sized Mercenary Enclaves.
Reduce, reuse, recycle.
Same as the old boss.
As a Subterranean empire, dig too deep, but prove yourself worthy.
As a Slingshot to the Stars empire, send 10 crewed science ships into the unknown with Quantum Catapults.
As a Teachers of the Shroud empire, prove that the Shroudwalkers made a terrible mistake.