Here is the full list of all 25 Kung Fu Panda: Showdown of Legendary Legends achievements worth 1,000 gamerscore.
Use 20 Different Awesome Attacks
Win 5 King of Inner Peace Matches
Win 5 All You Can Eat Matches
Win 5 King of Kung Fu Matches
Complete all Tutorial Lessons
KO 1000 Opponents
Win 10 Matches in Team Play
Play Practice
Check out a Fighter in the Character Bio
Win 10 Stock Matches
Reach Master Panda Online Ranking
Reach Master Mantis Online Ranking
Win 200 Matches
Win 100 Matches
Reach Instructor Mantis Online Ranking
Win 50 Matches
Use an Awesome Attack
Play 12 Different Levels
Win 10 Timed Matches
Play 8 Different Levels
Play 4 Different Levels
Win an Online Match
Beat Tournament of Legends with 6 Characters
Beat Tournament of Legends with 12 Characters
Beat Tournament of Legends with 20 Characters