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