Madden NFL 10

I don't take credit for this solution but it is one I found and it worked perfectly. Credit goes to daenius and SengIV from xbox360achievements.org.

http://www.xbox360achievements.org/game/madden-nfl-10/guide/

The best way to do this is once more using 2 Controllers. Let Controller 1 (the one that needs the Achievement) pick the Cardinals, for functionalities sake. Let Controller 2 pick the Browns. Also use this chance to make sure your difficulty is on All-Pro and turn rewinds to unlimited/infinity to make life easier. Now set up the start of the game so the Cardinals (Controller 1) kick off to the Browns (Controller 2). Catch the ball and run out of bounds at the 4(or 5) yard line.

Now let the Browns (Controller 2) pick a Punt, found under "By Formation > Special Teams > Punt".

With the Cardinals (Controller 1), pick a punt block, found under "By Formation > Special Teams > Punt Block".

Now with the Browns (Controller 2) flick the downwards ONE TIME. DO NOT FLICK THE STICK UPWARDS. This will give the defense enough time to run in and block the kick. Don't touch a single button after that, let the CPU take care of the rest.

As soon as two or more players dive for the ball, a fumble mini-game will trigger.
The idea of this mini-game is to tap the buttons shown and get the needle into your half of the bar.
To make things considerably easier, have Controller 1 press the right buttons while Controller 2 is pressing the wrong ones.

This Achievement will also get you the "Fight For The Fumble" Achievement.

I used the Patriots against Cardinals. I set Kurt Warner's stats all the way down to zero before starting the game. Unlimited rewinds were turned on, play clock turned off, and off-sides set to 0. I used two controllers, so I could easily set him up on their own 1 yard line.

The Rewind setting is after you select a team, hit the right trigger and it should be at the bottom.

I would make an attempt to get him to fumble by moving a defense player behind him, and once he snapped the ball I would turbo run into him pressing LB (this is the strip command).

If it did not work I would do a rewind. After the rewind I would cause an encroachment penalty, which I would decline. This resets your rewind and you can continue to do this until you have the achievement!

Good luck!

Me and a friend got this achievement today, You can get all achievements (as far as i know) in unranked games. We both used SD Chargers (to also get the Antonio Gates and LT achievements).

First we would run our kick out of bounds at the 1 then do a straight run up the middle or inside the tackles. The defensive player would run a 5/6 man blitz and as LT was about to be tackled we would lateral. 1/5 times Rivers wouldnt recieve the lateral and it would fall to the floor as a fumble.

This took us a few attempts each and on the fight for the fumble screen, the winner of the minigame (the player going for the TD would play it while the other would press nothing) didnt always win the ball for a TD. Just keep trying!

For those of you still looking for this one, an even easier way I found was to have the second controller attempt a fake punt pass (but not max protection).

Then, just have the punter (horrible ball handler) hang out in the end zone and strip him. I tried using the HB Toss in the end zone (in the Rooster Teeth videos here: http://roosterteeth.com/archive/?id=843&v=more ), but I couldn't ever force a fumble. I switched to a fake punt pass and did it the first try.