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