Here is the full list of all 19 Angel at Dusk achievements.
Clear all Awakening stages in Arcade Mode on Very Hard difficulty.
Survive the tutorial.
Clear all Descension stages in Arcade Mode on Very Hard difficulty.
Clear all Angel of Eternity stages in Arcade Mode on Very Hard difficulty.
Clear all Awakening stages in Arcade Mode on Extinction difficulty.
Clear all Descension stages in Arcade Mode on Extinction difficulty.
Clear all Angel of Eternity stages in Arcade Mode on Extinction difficulty.
Clear 16 Chronicle stages in Original Mode.
Clear 24 Chronicle stages in Original Mode.
Destroy the Angel of Eternity in Original Mode.
Unlock Lanmolidgiwd.
Unlock Labaju-ba-giw-m.
Unlock Zomiy-popolenmy.
Collect 256000 Green Blood Cells.
Collect 64000 Blue Blood Cells.
Collect 64000 Lipids.
Collect 4096 LV8 Medals.
Acquire all weapons.
Endure the Introductory Tutorial.