Dance Central 2
50 Achievements
1,000
25-30h
Xbox 360
Biggest Winner
Burned your first 100 calories in Fitness mode.
20
How to unlock the Biggest Winner achievement in Dance Central 2 - Definitive Guide
You do not have to get this through the fitness sessions. Access the fitness menu then enable Fitness Mode. Play through a few songs and the achievement should pop.
Refer to Thrash and Burn.