Ikaruga
Ikaruga has been played by members of XboxTweet. They unlocked these achievements (secret ones not listed):
- Dot Eater
Clear a certain chapter in any mode without shooting at all 
- Excellent grade
Complete Chapter 3 in any mode with a grade of A or better 
- Fine grade
Complete Chapter 2 in any mode with a grade of A or better 
- Good grade
Complete Chapter 1 in any mode with a grade of A or better 
- Star player
Complete the Final Chapter in any mode with a grade of A or better 
- Stellar grade
Complete Chapter 4 in any mode with a grade of A or better 
- Target: Buppousou
Destroy Buppousou! 
- Target: Eboshidori
Destroy Eboshidori! 
- Target: Misago
Destroy Misago! 
- Target: Tageri
Destroy Tageri! 
- Target: Uzura
Destroy Uzura! 
- Unstoppable
Clear the game in any mode without using Continue
