Here is the full list of all 12 Kings of Kung Fu achievements.
Complete the Story Mode without losing any round
Complete the Story Mode with one character
Win a round without losing any health
Win a battle in either: Story Mode or Versus Mode
Complete the Story Mode with all characters
Complete the Story Mode in max difficulty level
Complete the Story Mode without using any continue
Win a round with less than 10% health
10x hit combo
Win 10 consecutive games in Versus Mode
Win 20 consecutive games in Versus Mode
Win 100 consecutive games in Versus Mode