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