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