CHARACTERS
Dr. Mario- Beat Classic Mode with Mario  without using a continue or play vs mode 100 times
Luigi-Complete the first stage of     Adventure Mode with a time that has a 2 in the seconds spot (xx : x2 : xx). Then complete the game. Or play vs. mode 800 times
Gannondorf- complete Event 29 or play vs. mode 600 times
Falco- Complete the Hundred Man Melee. or play vs. mode 300 times
Young Link- Complete classic mode with 10 characters or play vs mode 500 times
Pichu-Complete Event 37 or play vs. mode 200 times
Jigglypuff- complete classic mode or adventure mode or play vs mode 50 times
Mewtwo
-Play Vs. Mode for 20 hours or play vs mode 700 times
Mr. Game & Watch
-Complete Classic mode or Break the Targets with all other characters. Or, play vs mode 1,000 times
Marth
-play vs mode with all 14 characters that are not unlocked or play vs. mode 400 times
Roy
-beat classic mode with Marth or play vs mode 900 times
Stages
Kingdom II- get the Birdo trophy
Brinstar Depths- play 50 vs matches
Fourside- play 100 vs matches
Big Blue- play 150 vs matches
Poke Floats- play 200 vs matches
Kongo Jungle- complete the 15 minute melee
Yoshi's Island- hit Sandbag 1300 feet in the home run contest
Dreamland- complete Break the Targets with all characters
Flatzone- complete classic, adventure, or all-star mode with Mr. Game & Watch
Battlefeild-complete All-Star mode
Final Destination
- beat all events
Modes
Sound Test- Clear all events
All Star Mode- unlock all secret characters
Event 51-
Complete all other event matches
Other
Mew- unlock all characters
Celebi- unlock all characters and stages