Here is the full list of all 20 Abstract Arena achievements.
Win 12 free-for-all matches choosing the blue ship.
Win 12 free-for-all matches choosing the purple ship.
Win 12 free-for-all matches choosing the red ship.
Win 12 free-for-all matches choosing the orange ship.
Win 12 free-for-all matches choosing the yellow ship.
Win 12 free-for-all matches choosing the green ship.
Use every power-up of the game at least one time.
Win a match using only power-ups in every game mode.
Win a free-for-all match without damaging any opponent.
Win a free-for-all match without getting hit by any opponent.
Win a match in all of the different maps available.
Win 12 free-for-all matches without power-ups in the Arena.
Win 6 free-for-all matches in every game mode.
Win 6 team matches in every game mode.
Win 6 matches in any game mode against level-5 opponents.
Collect the amount of 600 fragments in Leech mode.
Keep the Iris in Holder mode for a total of 12 minutes.
Play 6 duels in local-multiplayer mode.
Play 6 team matches in local-multiplayer mode.
Win 6 matches through LAN-multiplayer mode.