Here is the full list of all 12 Dance! It's Your Stage achievements worth 200 gamerscore.
Practice every song in Career mode at least once!
Finish Career mode with a gold medal for each song.
Complete Career mode.
Two players have to complete a song in Co-op mode without any mistakes.
Achieve a high score for a performance in Competition mode!
Achieve a high score for a performance in Co-op mode.
Change your outfit at least 10 times in Career mode!
In Career mode complete songs 7-13!
In Career mode complete the first six songs.
Complete a song without any mistakes.
Perform 100 moves in a row.
Perform 50 moves in a row.