The Leviathans Add-on for Stellaris has 12 achievements.
Lead the non-aligned powers to victory against an awakened empire
Destroy an enclave
Destroy a wraith
Take a trophy from a stellar being
Hatch the egg
Defeat a horrifying invader
Restore an ancient warship
Uncover the secrets of an ancient fortress
Recruit a scientist from the Curators
Purchase a rare resource from the Traders
Support the Artisan Troupe for 10 years
Birth a new universe