Here is the full list of all 14 Kuroi Tsubasa achievements.
You have unlocked all CG Images
You freed Yamamii from the shadow
Banana.
The dragon hath been slain
You freed Uehasu from the shadow
You freed Rurika from the shadow
You freed Onizuka from the shadow.
Senpai has had better days
Not everything in the past was bad, right?
You freed Puka from the shadow.
You have played through the prologue and are ready for action!
Finished the game
You reunited with your friends
You made the right choice, and the girl is happy.