All you have to do is have a pikmin saved game on your memory card.
Giga Bowser:
Complete adventure mode on medium difficulty (any # of lives) without continuing. After you fight Bowser you have to fight Giga Bowser, He's hard to KO.
Master Hand:
Complete Classic Mode on hard (any # of lives) without continuing.
Sand Bag:
Hit the sand bag over 1250 feet in the home run contest.
F-Zero Racers:
Collect every Red smash trophy.
Donkey Knog JR.:
Collect every Normal character trophy.
Crazy Hand:
Clear Adventure Mode on Hard or Very Hard Difficulty without using a continue.
Mach Rider:
Clear Classic Mode in 300 seconds or less.
Wolfen:
Clear Adventure Mode in 1,100 seconds or less.
Samus's Starship:
Escape from Brinstar in Adventure Mode.
Wario:
Clear All-Star Mode without using a continue.
Mew:
Clear All-Star Mode on Hard of Very Hard Difficulty
Target:
Clear Target Test with every character.
Lon Lon Milk:
Clear the Target Test with all characters in 1500 seconds or less (total).
Sheriff:
Clear the Target Test with all characters in 750 seconds or less (total).
SandBag:
Hit Sandbag 990 feet or more in the Homerun Contest.
Paper Mario:
Hit Sandbag 1485 feet or more in the Homerun Contest.
Unown:
Earn a combined total of 16,503 feet in the Home Run Contest.
Mute City:
Walk a total combined distance of 3300 feet or more.
Male Wire Frame:
Clear the 100-Man Melee in 240 seconds or less.
Female Wire Frame:
KO more than 100 enemies in the Endless Melee.
Fighting Wire Frames:
Survive the 15-Minute Melee.
Battlefield:
Clear All-Star Mode.
Metal Box:
Perform more than 10 combos in Training Mode.
Lip's Stick:
Perform more than 20 combos in Training Mode.
Bunny Hood:
Perform a combined total of more than 125 combos in Training Mode.
Maxim Tomato:
Play 10 vs. Mode Matches.
Heart Container:
Play 100 vs. Mode Matches.
Food:
Play 1000 vs. Mode matches.
Tom Nook:
Collect more than 1000 Coins.
Landmaster Tank:
Score a combined total of over 1000 KOs.
Diskun:
Score points in every Bonus Records category.
Marin:
Unlock the Sound Test.
Motion Sensor Bomb:
Clear Event # 1.
Goomba:
Clear Event # 14.
Entei:
Clear Event # 26.
Game & Watch:
Clear Event # 45.
Majora's Mask:
Clear Event # 47.
Final Destination:
Clear Event # 51.
Coin:
Play Coin Battle Mode more than 100 times.
Mr. Resetti:
KO more than five players in Cruel Melee Mode
Kraid:
Unlock the Brinstar Depghs stage.
Sudowoodo:
Unlock the Poké Floats stage.
Falcon Flyer:
Unlock the Big Blue stage
UFO:
Unlock Fourside.
Kirby Hat 4:
Unlock Jigglypuff, Mewtwo, Luigi, Marth, and Mr. Game & Watch.
Kirby Hat 5:
Unlock Ganondorf, Roy, Pichu, Young Link, Dr. Mario and Falco.
Celebi:
Find Celebi's Poké Ball in 1-P Mode.
Meowth:
Collect ever Blue Smash Trophy.