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