Here is the full list of all 12 Archaica: The Path of Light achievements.
Activate all Lightwells.
Find and activate all Megaliths.
Activate Stone Keys in 10 levels.
Put the Goddess of Fire into a deep slumber.
Find and collect the Dark Crystal for the Almanach.
Complete 20 levels by finding all collectibles.
Find and activate the Primal Well in the Desert City.
Collect 15 devices for the Almanach.
Complete one of the Great Realms without using a hint.
Collect chronicles from 3 realms.
Complete the Initiation Ring and activate the Realmgate.
Collect 15 Cells.