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