Here is the full list of all 21 Audioship achievements.
Finish 300 games.
Defeat 100,000 enemies.
Finish 100 games.
Play a Multiplayer game.
Complete a game without being hit.
Play a game with only the green color.
Play a game with only the blue color.
Play a game with only the yellow color.
Play a game with only the red color.
Finish 10 games.
Play a Test your luck game.
Play a game and get a steam score >900.
Play a game and get a steam score >800.
Press F to Pay Respects (in Credits)
Dont use the Power Mode in a game.
Play a game and get a steam score >600.
Play a game and get a steam score >500.
Play a game and get a steam score >700.
Play a game and get a steam score >400.
Finish 1 game.
Just start the game.