Here is the full list of all 30 Karaoke achievements worth 400 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
Best singer in the world!
Sea of Fans!
Reach for your dreams!
Register 100 songs in History
Turn up the heat with your poses!
You are the greatest!
Even your Fans can't do this!
Use 30,000 Moola all at once when leveling up
Earn 15,000 or more Fans with one song
Become the Legend!
Do a gig with a DJ in the backup band
Welcome to the top!
Do a gig with a chorus in the backup band
Do a gig with a keyboard in the backup band
Do a gig with a bass in the backup band
Earn 10,000 or more Fans in 1 session
Capacity limit? What capacity limit?
Do a gig with a guitar in the backup band
Sing 50 songs
Congratulations on going the distance!
So many songs in your repertoire!
Aim for the top!
Your Fans are copying you!
Sing 5 Favorite songs back to back
Come back and try some more freebies soon!
Your Fans are waiting for you...
Sing the same song twice in a row
Do a gig with a drum set in the backup band
Added a song via Smart Glass
Congratulations on your debut!