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