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