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