No missable achievements (plus 12 unknown)
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Collect 15 Cells.
Complete the Initiation Ring and activate the Realmgate.
Collect 15 devices for the Almanach.
Collect chronicles from 3 realms.
Complete 20 levels by finding all collectibles.
Find and activate the Primal Well in the Desert City.
Put the Goddess of Fire into a deep slumber.
Find and collect the Dark Crystal for the Almanach.
Complete one of the Great Realms without using a hint.
Activate Stone Keys in 10 levels.
Activate all Lightwells.
Find and activate all Megaliths.