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