Here is the full list of all 20 Squarena achievements.
Play 50 total games.
Shoot 5000 bullets.
Die 100 times.
Block 100 bullets.
Clashed 100 bullets.
Jump 5000 times.
Score 50 goals.
Teleport 1000 times.
Deflect a bullet three times before it disappears.
Block 1000 bullets
Destroy another player's teleport before they get to complete it.
Unlock the Gauntlet arena
Conquer the Gauntlet
Reach a high score of 20 in Target Practice
Reach a high score of 20 in Target Practice - Hard
Reach 50 shield deflections in a single match
reach 50 retries in an obstacle course in one session
Make it to the top in the Square Up! map.