Full list of all 20 Kinect PlayFit achievements worth 200 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox 360.
Burn 300 calories
Burn 600 calories
Burn 1300 calories
Burn 2600 calories
Burn 5000 calories
Burn 10000 calories
Burn calories two days in a row for a Daily Streak of two
Burn calories four days in a row for a Daily Streak of four
Burn calories seven days in a row for a Daily Streak of seven
Burn calories ten days in a row for a Daily Streak of ten
Burn 100 calories in each of two Kinect games
Burn 250 calories in each of three Kinect games
Burn 300 calories in each of four Kinect games
Burn 400 calories in each of four Kinect games
Burn 600 calories in each of four Kinect games
Burn 15000 calories between yourself and your friends
Burn 25000 calories between yourself and your friends
Burn 50000 calories between yourself and your friends
Burn 75000 calories between yourself and your friends
Burn 100000 calories between yourself and your friends