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 of a Bergson.
Free Anai-Sarava.
Free the blackmarketeer.
Bring Hope into the world.
Kill a boss with every playable character.
Upgrade The Book of Rea 15 times.
Upgrade 25 times in the workshop.
Rescue Mary.
Free Anai-Raha.
Free the runemender.
Unlock all playable characters.
Have 20000 Morv.
Free Anai-Dya.
Kill 100 enemies using hazards.
Kill 5000 enemies.
Have 3 runes equipped simultaneously.
Upgrade The Book of Rea 5 times.
Complete 5 in-run events.
Gain each obelisk effect at least once.
Kill 50 ferocious enemies.
Upgrade 10 times in the workshop.
Save the wolf cub.
Unlock a family trait of three different Bergsons.
Defeat the Spider King.
Unlock a family trait.
Free the shopkeeper.
Investigate the shrine of Rea.
Shelter the stargazer.
Reunite the automata.
Construct Ben's wine machine.
Complete 10 in-run events.
Upgrade 75 times in the workshop.
Unlock all family traits.
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.
Use 5 charms in the same dungeon run.
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.