Here is the full list of all 15 Gunvolt Chronicles: Luminous Avenger iX achievements.
Clear "Boss Rush" for the first time.
Unlock every song in the jukebox.
Clear "Sumeragi Secret Bunker 3" for the first time.
Purchase every ability for customization.
Clear "Sumeragi Secret Bunker 2" for the first time.
Clear "Sumeragi Secret Bunker 1" for the first time.
Clear "City Slums 2" for the first time.
Clear "Data Center Beta" for the first time.
Clear "Data Center Alpha" for the first time.
Clear "Radio Tower 'Artemis'" for the first time.
Clear "Medical Center" for the first time.
Clear "Auto-Fab Plant" for the first time.
Clear "Sumeragi Building 13" for the first time.
Clear "Store Ruins" for the first time.
Clear "City Slums" for the first time.