Here is the full list of all 25 Astronite achievements.
Finish the game.
Complete the game with all the upgrades.
Defeat The Unknown.
Solve all the puzzles.
Get all the upgrades.
Win the Fight Festival.
Balach says goodbye.
Defeat Possessed Yatli
Find the lost grave.
Complete all the 'Echo' rooms.
Collect all 'Sphirti' chests.
Defeat Khand.
Defeat Kubra.
Defeat Pacifying Machine.
Defeat Arthron.
Defeat bosses Akepoc and Akepac.
Thinking in the future.
Buy the double damage increase item.
A secret key for a secret room in a secret place.
Destroy the Drilling Machine.
Recover your 'shpirti' after dying.
Get your first upgrade.
Drown.
Defeat Kronch.
Meet The Unknown for the first time.