Killer Instinct

Meet up with somebody on your friends list for this achievement. Go to multiplayer and hit player vs human opponent. Scroll down to invite player and invite your friend. Both players pick Hisako. Player 1 wins match one and then both players hit rematch and player 2 wins the second. Both players now have this achievement.

All the "friendly" achievements are currently bugged in a good way; you need only finish an exhibition match vs. anyone. Win or Lose, the achievement will unlock at the end of the match, unless your opponent disconnects.

So jump into exhibition matches, pick hisako, finish the match, and then pick "select character" so you can get another friendly achievement. No friends or skills required.