This is a copy/paste from Madden 15 achievement by Kickerreed03
Alright guys My name is Kickerreed03 and i will help you get the Snickers Satisfying Comeback achievement in Madden 15
In order to get this achievement you need to:
"Comeback and win when trailing by 17+ points"
What this means is your opponent scores 21 points or 3 touchdowns with field goals made.
There is a video, he is playing on the Xbox box one but everything is the same
You can use 2 controllers
Set the quarters to 2-3 mins
Controller 1 is the main profile and use a team like the Patriots or Broncos
Controller 2 choose a bad team like the Browns or Buccaneers
Then let the other team score(Controller 2)
You HAVE to comeback in he second half(3rd and 4th quarters)
You CANT score any points in the 1st and 2nd quarter or it will not unlock.
Then for some reason you have to wait till the 4th quarter and then you can start to comeback and just score on them.
Then at the end of the game the the Achievement will pop and boom you are 30Gs richer
Thats it again from Kickerreed03
If there are any question feel free Pm at any time with the question.
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To add, to speed things up, set the quarters length to 2 minutes. Have controller 2 run a verticals play, while controller 1 runs punt block. Lob the pass to your X receiver (he shouldn't be covered) and juke the defender/punt receiver to score quickly. If you have to, have a run play and run backwards for a safety for an easy 2 points.
Once you scored at least 17 points (I ended up scoring 18 with 2 safeties and 2 TDs), run out the clock to end the first half. Then repeat with controller 1 to get the comeback.
Good luck!