If You complete the indicated task You'll get the allotted gamerscore.
Dancin' All Night (30) - Complete Endless Mode.
Ranked Master (25) - Win 10 consecutive ranked matches.
Superstar (25) - Earn a perfect rating on every song in Arcade Mode.
Veteran Dancer (20) - Earn a total lifetime score of 10 million points across all of your games.
Ranked Veteran (20) - Play 100 ranked matches.
Entertainer (20) - Get a combo of 100 or more in Arcade Mode.
Dance Master (15) - Score 90,000 points or more on every song in Arcade Mode.
Easy Clear (15) - Complete every song in Arcade Mode in 3-Button Mode.
Normal Clear (15) - Complete every song in Arcade Mode in 5-Button Mode.
Dance Pwnage (10) - Win a ranked match by 5,000 points or more..
Music Maniac (10) - Complete every song in Arcade Mode.
Ranked Match Newbie (5) - Win a ranked match.