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