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