| Achievement | How to unlock
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| American Idol ( 50 points ) | Win the full American Idol tournament at any difficulty level.
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| American Sensation ( 30 points ) | Win 20 American Idol single player tournaments.
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| Dedication ( 100 points ) | Score 50 million points ( cumulative in any mode).
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| Girl's Best Friend ( 100 points ) | Get a perfect score throughout a full American Idol tournament.
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| Global Star ( 10 points ) | Play an Xbox LIVE Arcade League match.
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| Golden Ticket ( 10 points ) | Pass the auditions phase in single player.
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| Grudge Match ( 10 points ) | Play an Xbox LIVE Head-to-Head match.
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| Headbanger ( 10 points ) | Compete offline in a battle Head to Head game.
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| Hero ( 50 points ) | Achieve Diamond Status for ten different songs.
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| Inspiration ( 10 points ) | Achieve Gold Status for every song on the disc.
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| It Didn't Take That Long ( 50 points ) | Score 10 million points ( cumulative in any mode).
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| It Sounds Like a Lot ( 20 points ) | Score 1 million points ( cumulative in any mode).
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| Just the Two of Us ( 10 points ) | Play an offline Co-op Duet.
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| Legend ( 75 points ) | Achieve Diamond Status for twenty different songs.
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| Maestro ( 175 points ) | Achieve Diamond Status for every song on the disc.
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| Megastar ( 10 points ) | Achieve Diamond Status for one song.
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| Million Seller ( 50 points ) | Achieve Platinum Status for every song on the disc.
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| Premiership ( 10 points ) | Compete offline in an Arcade League game.
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| Ranked Global Star Winner ( 15 points ) | Win an Xbox LIVE Arcade League ranked match.
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| Ranked Grudge Match Winner ( 15 points ) | Win an Xbox LIVE Head-to-Head ranked match.
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| Ranked World Tour Winner ( 15 points ) | Win an Xbox LIVE American Idol Tournament ranked match.
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| Superstar ( 25 points ) | Achieve Diamond Status for five different songs.
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| The First of Many ( 5 points ) | Achieve Platinum Status for one performance.
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| The Great American Songbook ( 20 points ) | Sing all the songs on the disc once - full song only.
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| The Showman ( 20 points ) | Complete a medley and receive Platinum Status.
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| Why Don't You Marry Him Then ( 15 points ) | Achieve "Excellent" comments from Simon three times in a row during an American Idol tournament.
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| World Idol ( 80 points ) | Win the full American Idol tournament at Expert difficulty level .
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| World Tour ( 10 points ) | Play an Xbox LIVE American Idol Tournament match.
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