Back in the Fight Achievement in Medal of Honor: Warfighter
Back in the Fight50
Completed one tour with all classes.
How to unlock Back in the Fight
There are 6 total online classes:
For this achievement, you must earn a total of 50,000xp per class, before awards and bonuses.
You can also view your progress of Battlelog under the Tours tab. The goal is to have "Best Grade" for each class. You can also see your current tour progress on that screen.