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