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.
Kill 5000 enemies.
Have 3 runes equipped simultaneously.
Unlock all playable characters.
Upgrade The Book of Rea 5 times.
Save the wolf cub.
Free Anai-Dya.
Kill 50 ferocious enemies.
Use 5 charms in the same dungeon run.
Gain each obelisk effect at least once.
Unlock a family trait of three different Bergsons.
Upgrade 10 times in the workshop.
Defeat the Spider King.
Free the shopkeeper.
Unlock a family trait.
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 100 enemies using hazards.
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.
Kill a boss without receiving damage.