| Achievement | How to unlock |
| 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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