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