Get More $$:
Go to the press start screen and press Y, X, White, Y, X, White, X, X, Y, White, X, Y
Get Reputation:
Go to the press start screen and press Y, Y, White, X, X, White, Y, Y, Y, X, X, X
Get All Missions:
Go to the press start screen and press X, X, White, White, Y, Y, White, X, Y, Y, X, White