Here is the full list of all 25 Unspottable achievements.
Punch a player out of the game area.
Finish a game with no robots left in Arena.
All players get punched by robots.
All players killed by bombs.
All players have been crushed.
All bots killed by bombs.
Punch the instructor 3 times in the same game.
All players punched by instructor.
Punch an opponent under a spotlight.
Unlock all characters.
2 players were punched in 2 seconds.
Bully someone 10 times in start scene.
Punch the spectator in Meadow.
Draw a game.
Punch all bots in start scene.
Complete a 1 point game.
3 players were punched in 2 seconds.
Complete a 99 points game.
Win a game without any opponents scoring any points.
Complete the tuto.
Leave the restaurant during your distract.
All the players got punched as they were about to leave.
All players have been punched when the lights were off.
Turn off the light 10 times in a game.
Use the teleporter 10 times.