Alright the one that I hated the most getting (because I wanted to see why they made it an achievement) is none other than "Extra Credit Award" from Guitar Hero II. Basically all you have to do is watch the credits which do not seem that bad, however, since it is roughly a half hour long...and they decided to be asses playing Push Push Lady Lighting, either every song or every other song at points, it really became monotonous.
If anyone else every goes for this, I suggest watching TV, taking a bath, shave, whatever else just don't put yourself through this.