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