"Excellent"
You completed the game on Expert difficulty.
30 
Mr. Sparkle
You made it to the stage 3 bosses in Survival Mode with the Japanese ROM.
25 
Release The Hounds
You completed the game in 30 minutes or less.
25 
Like Taking Candy From a Baby
You have completed the game once with each character.
25 
Best Score Ever
You scored 250 (US) or 25,000 (Japan) points in one game.
25 
Easier Than Arm Wrestling
You defeated the Wrestler without any player dying.
10 
Falling For Smithers
You fell through the deck after Smithers.
10 
It Tastes Like Burning
You hurt Smithers with one of his own bombs.
10 
Dysfunctional Family
You played in a 4-player match.
10 
Bongo's Angst
You got Bongo to appear in 4 different levels.
10 
Battling Seizure Robots
You defeated the battling robot.
10 
Helper Monkey
You damaged 25 enemies with a Team Attack.
10