Tekken Tag Tournament 2

To earn this achievement that's called "Iron Heartache", you must have fought at least three battles in Online mode.

-Select Online Mode
-Then select either Ranked Match or Player Match, it doesn't make a difference which one you play.
-Next, select Begin Search.
-From, you can chose to go at it Solo or Tag. Choose either option, then choose your fighter.
-Practice with a dummy Mokujin while waiting for a human opponent to accept your challenge. You'll know when you'll get into a fight as soon as it says "Here comes a new challenger!" flashes on the screen.
-Fight all three rounds and get through the battle!

It doesn't matter if you win or lose all three battles. Once you are finished with your third batte in Online Mode, the achievement will unlock.

Have fun and good luck!

For this achievement you simply need to play 3 online matches (Win or Lose). I'd suggest doing this on player match so it won't be recorded as a loss as a ranked match would do. If you're feeling competitive and want to win I suggest selecting quick match and when refining your search setting the ranks to 2+ only, this ensures that your opponent will be no more than 2 ranks higher, there's a higher chance of them having the same amount of experience as you so you could maybe win easier. It doesn't matter who you use for this achievement but I would personally use Forest Law and Paul because Law has his really fast kicks and Paul has his really strong strokes. :)

Good Luck xP