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