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