Here is the full list of all 16 Devouring Stars achievements.
Gather all the stars with Curbas
Escape through an enemy portal
Discover Hephaistos hideout and survive
Rebuild Chaos
Destroy more than 4 entities with Phaeton
Put off the furies
Freeze more than 10 enemies with Aether
Start a level with more than 5 enemies against one of yours
Take control of more than 5 units with Clotho
Finish the first game cycle
Finish 10 runs in a row without dying
Use Orion more than 5 times
Access the full reference trees
Start a run with 8 entities
Win against two armies
Fight a strong entity