Here is the full list of all 32 Metaball achievements.
Play a game with a friend in your friend's list
Try Quick Chatting in a game
In PvP, consume 30 nitro
Play Shield training once
Play Grab training once
Play Layup training once
Play Side Swing training once
Complete the basic tutorial
Play free play mode once
Score your first goal in PVP
In PvP, perform 100 passes
In PvP, perform 10 saves
In PvP, score 100 three pointer
In PvP, score 100 two pointer
In PvP, perform 100 triple jump
In PvP, score 100 time with a power shot
Complete the Layup Challenge in under 60 seconds.
Complete all guide quests up to step 4.
In PvP, win the game without conceding a goal
In PvP mode, be selected as MVP after joining a match that already started
Clear the Dunk Challenge in under 60 seconds.
In PvP, be selected 30 times as the MVP
Complete 20 match in Meta City (day)
In PvP, win with more than 20 points difference
Complete 20 match in Meta City (night)
In PvP, score 1 times with the Golden Ball
In PvP, score 10 times with the Golden Ball
Achieve 5 consecutive wins in PvP
Achieve 10 consecutive wins in PvP
Score within 10 seconds after the match started
Play in a private match
Make a draw in a PvP match