Here is the full list of all 49 Asterigos: Curse of the Stars achievements.
Complete A Round of Game With Level 20 or Lower
Witness Minerva's Sacrifice
Defeat Eumenides
Activate All Conduits
Complete All Trinity Challenges
Defeat Pallas
Defeat All Mimics
Defeat Astraix
Defeat Breathless
Defeat Wassily
Defeat Soleucus
Defeat Anagnos
Defeat Doron
Defeat Kavouras
Defeat Miltos
Defeat Hiems
Progress To The Event of Trinity
Collect All Scores
Defeat Andreas
Finish the Loser Noble Quest
Defeat Marble
Finish Otto's Last Resort Quest
Activate the Bridge to the Depths
Collect At Least 20 Craftable Trinkets
Open 50 Treasure Chests
Defeat Bion In The Final Training
Defeat the Black Warden
Defeat Avatar of Titan
Upgrade Four Enhancements To Max Level
Upgrade A Weapon To Max Level
Upgrade Three Weapons To Max Level
Upgrade An Enhancement To Max Level
Progress To The Event of The Laurel Craft
Read 100 Discoveries Documents
Defeat Garrison
Gain Starlight's Trust
Defeat Colossi
Defeat Baraad
Defeat Eulalia
Defeat Raveneous
Retrieve All Weapons
Complete All Achievements
Witness Minerva's Determination
Finish Bion's Dogtags Quest
Defeat All Teumess
Defeat All Hellhounds
Read 250 Discoveries Documents
Open All Treasure Chests
Collect All Echoes