Complete the following achievements to unlock Xbox Live Gamerscore points.
| Unlockable: | How to Unlock: |
| American Idol (50 pts) | Win the full American Idol tournament at any difficulty level. |
| American Sensation (30 pts) | Win 20 American Idol single player tournaments. |
| Dedication (100 pts) | Score 50 million points (cumulative in any mode). |
| Girl's Best Friend (100 pts) | Get a perfect score throughout a full American Idol tournament. |
| Global Star (10 pts) | Play an Xbox LIVE Arcade League match. |
| Golden Ticket (10 pts) | Pass the auditions phase in single player. |
| Grudge Match (10 pts) | Play an Xbox LIVE Head-to-Head match. |
| Headbanger (10 pts) | Compete offline in a battle Head to Head game. |
| Hero (50 pts) | Achieve Diamond Status for ten different songs. |
| Inspiration (10 pts) | Achieve Gold Status for every song on the disc. |
| It Didn't Take That Long (50 pts) | Score 10 million points (cumulative in any mode). |
| It Sounds Like a Lot (20 pts) | Score 1 million points (cumulative in any mode). |
| Just the Two of Us (10 pts) | Play an offline Co-op Duet. |
| Legend (75 pts) | Achieve Diamond Status for twenty different songs. |
| Maestro (175 pts) | Achieve Diamond Status for every song on the disc. |
| Megastar (10 pts) | Achieve Diamond Status for one song. |
| Million Seller (50 pts) | Achieve Platinum Status for every song on the disc. |
| Premiership (10 pts) | Compete offline in an Arcade League game. |
| Ranked Global Star Winner (15 pts) | Win an Xbox LIVE Arcade League ranked match. |
| Ranked Grudge Match Winner (15 pts) | Win an Xbox LIVE Head-to-Head ranked match. |
| Ranked World Tour Winner (15 pts) | Win an Xbox LIVE American Idol Tournament ranked match. |
| Superstar (25 pts) | Achieve Diamond Status for five different songs. |
| The First of Many (5 pts) | Achieve Platinum Status for one performance. |
| The Great American Songbook (20 pts) | Sing all the songs on the disc once - full song only. |
| The Showman (20 pts) | Complete a medley and receive Platinum Status. |
| Why Don't You Marry Him Then (15 pts) | Achieve "Excellent" comments from Simon three times in a row during an American Idol tournament. |
| World Idol (80 pts) | Win the full American Idol tournament at Expert difficulty level . |
| World Tour (10 pts) | Play an Xbox LIVE American Idol Tournament match. |
Meet the following conditions to unlock these characters.
Meet the following conditions to unlock these videos to view in "Video" mode.
| Unlockable: | How to Unlock: |
| All Judges | Complete the full American Idol mode. |
| Hemorrhage (In My Hands) | Earn a Platinum Record for the song Hemorrhage (In My Hands). |
| I Don't Want To Miss A Thing | Earn a Platinum Record for the song I Don't Want To Miss A Thing. |
| Midnight Train To Georgia | Earn a Platinum Record for the song Midnight Train To Georgia. |
| Over The Rainbow | Earn a Platinum Record for the song Over The Rainbow. |
| Paula Abdul | Complete the the mini American Idol mode. |
| Randy Jackson | Complete the short American Idol mode. |
| Simon Cowell | Complete the medium American Idol mode. |
| Time Of The Season | Earn a Platinum Record for the song Time Of The Season. |
| You Can't Hurry Love | Earn a Platinum Record for the song You Can't Hurry Love. |
Meet the following conditions to unlock these songs.
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