The Party Classics Expansion Disc Add-on for Lips has 9 achievements worth 250 gamerscore.
Gain 200,000 total stars
Earn 1,500 total medals
Get "Cool" in every page for a song in Co-op mode
Score points in all 40 Lips Party Classics songs
Score points in 20 or more Lips Party Classics songs
Score points in 10 or more Lips Party Classics songs
Record and view three songs with Performance Recording
Sing 10 songs in Freestyle
Earn a Big Bang rating in Co-op mode