Here is the full list of all 22 Kung Fu Panda Showdown of Legendary Legends achievements.
Win 10 Stock Matches
Win 10 Matches in Team Play
Play 8 Different Levels
Play 4 Different Levels
Play Practice
Complete all Tutorial Lessons
Check out a Fighter in the Character Bio
Use an Awesome Attack
Beat Tournament of Legends with 6 Characters
Beat Tournament of Legends with 12 Characters
Beat Tournament of Legends with 20 Characters
Play 12 Different Levels
Use 20 Different Awesome Attacks
Win 10 Timed Matches
Win 5 King of Kung Fu Matches
Win 5 Master of Inner Peace Matches
Win 5 All You Can Eat Matches
KO 1000 Opponents
Win 50 Matches
Win 100 Matches
Win 200 Matches
Win an Online Match