Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Buppousou	Destroy Chapter 2 Boss: Buppousou.
Dot Eater !	Clear a certain chapter in any mode without shooting at all.
Eboshidori	Destroy Chapter 1 Boss: Eboshidori.
Grade A (Chapter 1)	Complete Chapter 1 in any mode with a grade of A or better.
Grade A (Chapter 2)	Complete Chapter 2 in any mode with a grade of A or better.
Grade A (Chapter 3)	Complete Chapter 3 in any mode with a grade of A or better.
Grade A (Chapter 4)	Complete Chapter 4 in any mode with a grade of A or better.
Grade A (Final Chapter)	Complete the Final Chapter in any mode with a grade of A or better.
Grade S (Chapter 1)	Complete Chapter 1 in any mode with a grade of S or better.
Grade S (Chapter 2)	Complete Chapter 2 in any mode with a grade of S or better.
Grade S (Chapter 3)	Complete Chapter 3 in any mode with a grade of S or better.
Grade S (Chapter 4)	Complete Chapter 4 in any mode with a grade of S or better.
Grade S (Final Chapter)	Complete the Final Chapter in any mode with a grade of S or better.
Grade S++ (Chapter 1)	Complete Chapter 1 in any mode with a grade of S++.
Grade S++ (Chapter 2)	Complete Chapter 2 in any mode with a grade of S++.
Grade S++ (Chapter 3)	Complete Chapter 3 in any mode with a grade of S++.
Grade S++ (Chapter 4)	Complete Chapter 4 in any mode with a grade of S++.
Grade S++ (Final Chapter)	Complete the Final Chapter in any mode with a grade of S++.
Ikaruga & Ginkei	Complete one chapter in any Co-op mode without using Continue.
Ikaruga & Ginkei 2	Complete three chapters in any Co-op mode without using Continue.
Ikaruga & Ginkei, One coin clear	Clear the game in any Co-op mode without using Continue.
Misago	Destroy Chapter 4 Boss: Misago.
One coin clear	Clear the game in any mode without using Continue.
Tageri	Destroy Final Chapter Boss: Tageri.
Uzura	Destroy Chapter 3 Boss: Uzura.