Here is the full list of all 44 Metagalactic Blitz achievements.
Beat dodgebot on easy mode.
Beat dodgebot on medium mode.
Beat dodgebot on hard mode.
Beat dodgebot on death mode.
Beat deathmode dodgebot with Ace.
Beat deathmode dodgebot with Zomborg.
Beat deathmode dodgebot with Sydney.
Beat deathmode dodgebot with Polly.
Beat deathmode dodgebot with Max.
Beat deathmode dodgebot with Lt. Justice.
Beat deathmode dodgebot with Veronica.
Beat deathmode dodgebot with Goliath.
Beat deathmode dodgebot with Zandra.
Beat deathmode dodgebot with... well, Dodgebot!
Beat deathmode dodgebot with 9 different characters.
Played a match with 9 different characters.
Get a x5 chain reflect.
Get a x100 chain reflect.
Spammed taunt against a dodgebot.
Figure out how to play as Dodgebot.
Steal 20 balls in a single online match as Max.
After discovering taunt, don't use taunt for 15 online matches in a row.
Reach the Silver online rank.
Reach the Gold online rank.
Reach the Platinum online rank.
Play 50 online games.
Win 10 total online games.
Win 50 total online games.
Win an online match.
Win 2 online matches in a row.
Win 5 online matches in a row.
Win 10 online matches in a row.
Take an opponent's stock without taking damage in an online game.
Win an online match without using abilities.
Win an online match without dealing dodgeball damage.
Win 10 online matches as a random character.
Win 40 online matches as a random character.
Rematch an online opponent twice in a row.
Demand a rematch against 6 different online opponents.
Add an online opponent as a friend.
Unlock Lieutenant Justice.
Unlock Veronica.
Unlock Zandra.
Unlock Polly.