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