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