Mario Kart Wii
Mario Kart Wii Unlockables
Mii (Outfit B)
Unlock all 32 Expert time trials (you don't have to beat them), and you will unlock your Mii in Mario/Luigi overalls (depending on your Mii's preferred color).
Submitted By: Mr Moffat
Golden Stars
If you get a 1 star rank on all races in all cups, you'll get a star next to your name when playing online. If u have 2 star rank in every race on every cup, you'll have 2 stars next to your name and you'll get a third star with 3.
Submitted By: nathan.g
Unlockable Characters
Baby Daisy - 1 Star in all 50cc Wii-Cups
Baby Luigi - Unlock 8 Expert Staff Ghost Data in Time Trials
Birdo - Play Time Trials on 16 different courses
Bowser Jr. - 1 Star in all 100cc Retro-Cups
Daisy - Win 150cc Special Cup
Diddy Kong - Complete all 50cc Cups
Dry Bones - Win 100cc Leaf Cup
Dry Bowser - 1 Star in all 150cc Wii-Cups
Funky Kong - Unlock 4 Expert Staff Ghost Data in Time Trials
King Boo - Win 50cc Star Cup
Mii (Outfit A) - Win 100cc Special Cup
Rosalina - Have a Super Mario Galaxy savefile and she will be unlocked after some GPs
Toadette - Play Time Trials on all 32 different courses
Submitted By: Snoozing Snorlax
Unlockable Races
Leaf Cup - Win at least 3rd place in Banana Cup
Lightning Cup - Win at least 3rd place in Leaf Cup
Special Cup - Win at least 3rd place in Star Cup
Star Cup - Win at least 3rd place in Flower Cup
Mirror Mode - Win all Cups at 150cc
Submitted By: Snoozing Snorlax
Unlockable Vehicles
Bubble Bike (small bike) - Win Mirror Leaf Cup
Dolphin Dasher (medium bike) - Win Mirror Star Cup
Magikruiser (small bike) - Play Time Trials on 8 different courses
Nitrocycle (medium bike) - Attain at least 1 Star Rank for all 100cc Wii Grand Prix Cups
Phantom (large bike) - Win Mirror Special Cup
Quacker (small bike) - Win 150cc Star Cup
Rapide (medium bike) - Win 100cc Lightning Cup
Torpedo (large bike) - Unlock 12 Expert Staff Ghost Data in Time Trials
Twinkle Star (large bike) - Win 100cc Star Cup
Blue Falcon (small kart) - Win Mirror Lightning Cup
Cheep Charger (small kart) - Attain at least 1 Star Rank for all 50cc Retro Grand Prix Cups
Dragonetti (large kart) - Win 150cc Lightning Cup
Piranha Prowler (large kart) - Win 50cc Special Cup
Rally Romper (small kart) - Unlock 1 Expert Staff Ghost Data in Time Trials
Royal Racer (medium kart) - Win 150cc Leaf Cup
Turbo Blooper (medium kart) - Win 50cc Leaf Cup
Submitted By: Snoozing Snorlax