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