Here is the full list of all 15 Country Dance All Stars achievements worth 1,000 gamerscore.
Play 20 different songs in any scored game mode
Play 33 songs in the starting Song Selection in any scored game mode
Play 10 songs of Challenge Rating 1 in any scored game mode
Play 10 songs of Challenge Rating 2 in any scored game mode
Play 10 songs of Challenge Rating 3 in any scored game mode
Play 15 songs in Normal mode
Play 15 songs in Perfection mode
Play 15 songs in Freeze mode
Play 15 songs with Helper Icons turned off
Play 20 songs in any scored game mode in 2-player Cooperative
Play 20 songs in any scored game mode in 2-player Competitive
Play the game for a cumulative time of at least 10 hours
Earn scores of 500,000 or more on 30 different songs in any scored game mode
Hot Streak a total of 50 times while in any single player scored game mode
Hot Streak a total of 50 times while in 2-player Cooperative