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