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