Here is the full list of all 20 Wrecking Towers achievements.
Hit 10 ink cans in a match
Red wins!
Win with more than 80% energy
Finish your first match
Play with 4 people but only 2 controllers
Finish 10 matches
Finish 50 matches
Blue wins!
Play a Match with 4 players
2 guys, 1 joystick
Use the Sledgehammer
Buttify your oponent 5 times in a single match
All players choose the same character
Hit one player with all weapons in one single match
Win with least than 30% energy
Discover the secret mode using the "not so secret" code...
Rebound the ink can 3 times
Stun yourself and your oponent at the same time
4 player, 4 stuns...
Take a weapon thrown by another player