Here is the full list of all 45 Children of Morta achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Defeat OU.
Free Anai-Sarava.
Gain each obelisk effect at least once.
Upgrade The Book of Rea 5 times.
Unlock all family traits of a Bergson.
Free the blackmarketeer.
Kill 100 enemies using hazards.
Bring Hope into the world.
Have 3 runes equipped simultaneously.
Shelter the stargazer.
Free Anai-Raha.
Kill a boss with every playable character.
Upgrade 25 times in the workshop.
Unlock all playable characters.
Rescue Mary.
Free the runemender.
Kill 5000 enemies.
Free Anai-Dya.
Kill 50 ferocious enemies.
Save the wolf cub.
Upgrade 10 times in the workshop.
Defeat the Spider King.
Unlock a family trait of three different Bergsons.
Free the shopkeeper.
Use 5 charms in the same dungeon run.
Unlock a family trait.
Investigate the shrine of Rea.
Reunite the automata.
Construct Ben's wine machine.
Complete 5 in-run events.
Complete 10 in-run events.
Upgrade 75 times in the workshop.
Upgrade The Book of Rea 15 times.
Unlock all family traits.
Have 20000 Morv.
Bring back 15 souvenirs from the dungeons.
Find 20 journals.
Resolve 20 puzzle events.
Complete 10 challenge rooms.
Find 10 divine items in a single dungeon.
Kill 250 ferocious enemies.
Finish a dungeon in co-op mode.
Revive 5 times in co-op mode.
Find 10 secrets.
Kill a boss without receiving damage.