Marvel vs. Capcom 3: Fate of Two Worlds

This one should be unlocked by the time you unlock "Waiting for the Trade." A single run of Arcade Mode on the lowest difficulty will give you roughly 3,000 points, and with 36 characters that's more than enough for 100,000 PP.

For this achievement you'll need to accumulate a total of 100,000 Player Points (PP).

This achievement will be a work-in-progress as you casually play the game. Everything you do in the game from Arcade mode, Training, or Ranked/Player Online will earn you Player Points, whether you win or lose. The better you are however, the more PP you'll earn. Once you gain 100,000PP you'll pop this 50G achievement.

P.S. To track your progress you can always view your gaming license at the Main Menu.