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