Here is the full list of all 24 Lupinball achievements.
Play 300 online matches
You won a round where over 25 shots were fired
Play 200 online matches
Clean-sweep an online match (ie. win a match while all your opponents get zero points)
Play 150 online matches
Fire 1,000 shots
Play 100 online matches
Play 75 online matches
You won a round that ended while the screen was upside down
You won a round where you shielded over twice as often as you shot (must shoot at least once)
Play 50 online matches
Play 30 online matches
You won a round without firing a single shot
Play 20 online matches
You fired the most shots out of everyone, and still lost
Play 10 online matches
Play 5 online matches
Play 1 online match
Everyone got shocked/stunned at least once in the same round
In a 4-player round, all your foes were blocked by the Orb Blocker when they died
Complete a 5-point 4-player local multiplayer match
Play 500 online matches
Play 777 online matches
Play 1,000 online matches