Here is the full list of all 16 Devouring Stars achievements.
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
Gather all the stars with Curbas
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