Def Jam Rapstar
51 Achievements
PS3
Off The Chain
Unlock all locked content in Career mode
3.8%
How to unlock the Off The Chain achievement in Def Jam Rapstar - Definitive Guide
You will get this naturally while going for the ‘Microphone Fiend!’ trophy. There are a total of 85 unlockables in the game and you can check your progress toward them under the Extras, Player Stats section on the main menu.
This will be unlocked while attempting the "Microphone Fiend!" achievement. There are 85 rewards to be unlocked, and they are only unlocked by obtaining mics. It unlocked for me after obtaining roughly 300 mics of the possible 305. You can check the progress of this by going to the main menu and selecting "Extras" and then "Player Stats".