Mario Kart Wii/Unlockables

The unlockables below are listed in the order that they can be optimally unlocked (e.g. by beating all 50CC circuits, and then all 100CC circuits, all 150CC circuits, then all mirrored circuits). Time trial rewards are listed last, but can be completed at any time.

Cups
Each unlockable circuit has to be unlocked separately for 50CC, 100CC, and 150CC.
 * Star Cup: get a silver trophy (second place) or better on Mushroom Cup and Flower Cup.
 * Leaf Cup: get a silver trophy (second place) or better on Shell Cup and Banana Cup.
 * Special Cup: get a silver trophy (second place) or better on Star Cup.
 * Lightning Cup: get a silver trophy (second place) or better on Leaf Cup.
 * Mirror Mode: get a gold trophy (first place) in all 150CC cups.
 * Star Cup in Mirror Mode: get a silver trophy (second place) or better on Mushroom Cup in Mirror Mode and Flower Cup in Mirror Mode.
 * Leaf Cup in Mirror Mode: get a silver trophy (second place) or better on Shell Cup in Mirror Mode and Banana Cup in Mirror Mode.
 * Special Cup in Mirror Mode: get a silver trophy (second place) or better on Star Cup in Mirror Mode.
 * Lightning Cup in Mirror Mode: get a silver trophy (second place) or better on Leaf Cup in Mirror Mode.

Characters

 * Grand Prix
 * King Boo: Do Star Cup on 50 cc or play 750 races.
 * Diddy Kong: Do Lightning Cup on 50 cc or play 450 races.
 * Baby Daisy: Get a gold trophy in all cups on 50 cc or play 1,950 races.
 * Dry Bones: Do Leaf Cup on 100 cc or play 1,050 races.
 * Mii Outfit A: Do Special Cup on 100 cc or play 1,650 races.
 * Bowser Jr.: Get a gold trophy in all cups on 100 cc or play 3,450 races.
 * Daisy: Do Special Cup on 150 cc or play 2,850 races.
 * Dry Bowser- Get a gold trophy in all cups on 150 cc or play 4,350 races.
 * Rosalina- Get a gold trophy in all cups on Mirror Mode, play 50 races (with a Super Mario Galaxy save file), or play 4,950 races (with no Super Mario Galaxy save file).


 * Time Trials
 * Birdo: Do Time Trials on 16 different race stages, play 1,350 races, or win 250 WFC races.
 * Funky Kong: Do Time Trials and unlock 4 expert staff ghosts, play 2,250 races, or win 25 WFC races.
 * Toadette: Do Time Trials on all 32 race stages, play 2,550 races, or win 1,000 WFC races.
 * Baby Luigi: Do Time Trials and unlock 8 expert staff ghosts, play 3,150 races, or win 100 WFC races.
 * Mii Outfit B: Do Time Trials and unlock all expert staff ghosts, play 5,100 races and battles, or win 5,000 WFC races

Karts and Bikes

 * 50CC rewards
 * 50CC bikes in 50CC Grand Prix: get a silver trophy (second place) or better on all eight normal 50CC circuits.
 * Super Blooper (medium kart): get a gold trophy (first place) in the 50CC Leaf Cup.
 * Piranha Prowler (heavy kart): get a gold trophy (first place) in the 50CC Special Cup.
 * Cheep Charger (small kart): get a one star (or better) rank in "the entire Retro Grand Prix on 50cc" (all 50CC Cups).


 * 100CC rewards
 * Shooting Star (heavy bike): get a gold trophy (first place) in the 100CC Star Cup.
 * Zip Zip (medium bike): get a gold trophy (first place) in the 100CC Lightning Cup.
 * 100CC karts in 100CC Grand Prix: get a silver trophy (second place) or better on all eight normal 100CC circuits.


 * 150CC rewards
 * Quacker (small bike): get a gold trophy (first place) in the 150CC Star Cup.
 * Day Tripper (medium kart): get a gold trophy (first place) in the 150CC Leaf Cup.
 * Honeycoupe (large kart): get a gold trophy (first place) in the 150CC Lightning Cup.


 * Mirror Mode rewards
 * Dolphin Dasher (medium bike): get a gold trophy (first place) in the Star Cup in Mirror Mode.
 * Jet Bubble (small bike): get a gold trophy (first place) in the Leaf Cup in Mirror Mode.
 * Phantom (large bike): get a gold trophy (first place) in the Special Cup in Mirror Mode.
 * Blue Falcon (small kart): get a gold trophy (first place) in the Lightning Cup in Mirror Mode.


 * Time Trial rewards
 * Magikruiser (small bike): complete 8 time trials with any time.
 * Tiny Titan (small kart): unlock a "fast staff ghost" (expert staff ghost).
 * Spear (large bike): unlock 12 "fast staff ghosts" (expert staff ghosts).
 * Sprinter (medium kart): unlock 24 "fast staff ghosts" (expert staff ghosts).