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