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