Def Jam Rapstar
51 Achievements
Livin' Your Life
Play 300 performances across all game modes
3.4%
How to unlock the Livin' Your Life achievement in Def Jam Rapstar - Definitive Guide
TheCaptain388
I recommend saving this trophy for the very last. Throughout all the performances, 305 mics, etc. you should probably have around 100-150 performances. So, to get the rest of them, simply set up a long playlist with a short song like “We Fly High” or “Rockwilder”. Just set the microphone down and let them play while pressing 
twice at the end of each song. You cannot fail a song, so no matter how bad you do it’ll still count as a performance. You can check your progress towards this under Extras, Player Stats at the main menu.
ChrisD0811
The best thing to do for this one is wait until you have all 49 of the other achievements. From the main menu go to "Extras" and "Player Stats" and add up the total of Solo, Battle, and Duet Performances. You need 300. Now go to party mode, and create a playlist of "We Fly High" repeatedly. The game has no fail built-in, so you can start the next song in the list and walk away for a couple of minutes. Anyone who has a turbo controller CAN set the button to repeatedly press A and it will start the next one for them, as 
is the only button needed to be pressed (twice between each song). When the setlist ends, your achievement will pop.