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