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