Achievements: The Best and The Worst.

[Mistershine]

Worst: GH3's 'Nearly there'. All you have top do is fail a song after 90%, so you just hammer the strum bar and get it.
Best: I think Bullet Witches 'Complete entire game on hell difficulty' is cool, as you only get 1g for it, so its the achievement, rather than the score that counts.