World Idol
Win the full American Idol tournament at Expert difficulty level
80 ✓ May 15th, 2008
Legend
Achieve Diamond Status for twenty different songs
75 ✓ December 15th, 2009
American Idol
Win the full American Idol tournament at any difficulty level
50 ✓ May 15th, 2008
Hero
Achieve Diamond Status for ten different songs
50 ✓ May 14th, 2008
Superstar
Achieve Diamond Status for five different songs
25 ✓ May 14th, 2008
The Showman
Complete a medley and receive Platinum Status
20 ✓ May 14th, 2008
It Sounds Like a Lot
Score 1 million points (cumulative in any mode)
20 ✓ May 14th, 2008
Ranked Grudge Match Winner
Win an Xbox LIVE Head-to-Head ranked match
15 ✓ June 8th, 2008
Why Don't You Marry Him Then
Achieve "Excellent" comments from Simon three times in a row during an American Idol tournament
15 ✓ May 14th, 2008
Headbanger
Compete offline in a battle Head to Head game
10 ✓ May 14th, 2008
Premiership
Compete offline in an Arcade League game
10 ✓ May 12th, 2008
Just the Two of Us
Play an offline Co-op Duet
10 ✓ May 14th, 2008
Grudge Match
Play an Xbox LIVE Head-to-Head match
10 ✓ June 8th, 2008
Megastar
Achieve Diamond Status for one song
10 ✓ May 14th, 2008
Golden Ticket
Pass the auditions phase in single player
10 ✓ May 14th, 2008
The First of Many
Achieve Platinum Status for one performance
5 ✓ May 12th, 2008
Maestro
Achieve Diamond Status for every song on the disc
175 
Dedication
Score 50 million points (cumulative in any mode)
100 
Girl’s Best Friend
Get a perfect score throughout a full American Idol tournament
100 
Million Seller
Achieve Platinum Status for every song on the disc
50 
It Didn't Take That Long
Score 10 million points (cumulative in any mode)
50 
American Sensation
Win 20 American Idol single player tournaments
30 
The Great American Songbook
Sing all the songs on the disc once - full song only
20 
Ranked World Tour Winner
Win an Xbox LIVE American Idol Tournament ranked match
15 
Ranked Global Star Winner
Win an Xbox LIVE Arcade League ranked match
15 
World Tour
Play an Xbox LIVE American Idol Tournament match
10 
Global Star
Play an Xbox LIVE Arcade League match
10 
Inspiration
Achieve Gold Status for every song on the disc
10