Here is the full list of all 12 GUNDAM EVOLUTION achievements.
Recover 10 allies total and reach (Casual/Ranked) Match Results
Join 10 casual or ranked matches and reach (Casual/Ranked) Match Results
Get MVP in a Casual or Ranked Match
Get a 5 player kill streak and reach (Casual/Ranked) Match Results
Reach Gold Rank
Reach Silver Rank
Reach Bronze Rank
Reach Player Level 50
Reach Player Level 10
Get 500 critical hits total and reach (Casual/Ranked) Match Results
Get 1,000 kills total and reach (Casual/Ranked) Match Results
Complete all Beginner's Challenges and claim rewards