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