The Synthetic Dawn Story Pack Add-on for Stellaris has 5 achievements.
As a Driven Assimilator, own cyborg Pops of at least 5 different species.
As a Rogue Servitor, own at least 30 Pops from Fallen Empires.
As a Determined Exterminator, conquer or eliminate all biological Empires in the galaxy.
Terraform a planet into a Machine World.
Shut down the Contingency plan.