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