WarZoNe

There's a way to get the Private First Class achievement now even if you started the game and skipped it the first time from the bonus XP. You do have to reset your rank though, but if you want the achievement bad enough (like I did) here's how to do it.

1. Go to dashboard and sign out so there are no profiles signed in.
2. Start up the game and press start at the first screen to go to the main menu where you will get a warning that says something like "You cannot save with no profiles signed in".
3. Press A to the warning and you will get a screen to start making a new character with a choice of either a male or female character. Press B when you get to this screen.
4. You should now be back at the "Press start" screen. Press the guide button to bring up your profile and start to sign in.
5. Right when it goes from loading your profile (with the lights going in a circle) to when it bring up your gamercard, messages, and friends screen, immediately press the guide button to take it away and then immediately affter that press start to go the main menu.

Your rank should be reset to recruit now where you can go from there to get PFC. I reset mine last night after I got Elite but it shouldn't take long to get it back.