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