Mario Kart DS - Platform: Nintendo DS

Leaf Cup:
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Win a Gold trophy in the Shell Cup and Banana Cup to unlock the Leaf Cup for 
that class. 

Lightning Cup:
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Win a Gold trophy in the Leaf Cup to unlock the Lightning Cup for that class. 

Rainbow Cup:
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Beat all the Staff Ghost Data on the Retro tracks to unlock the Rainbow Cup in 
the Retro Grand Prix. 

Star Cup:
---------
Win a Gold trophy in the Mushroom Cup and Flower Cup to unlock the Star Cup for 
that class. 

Special Cup:
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Win a Gold trophy in the Star Cup to unlock the Special Cup for that class. 

150cc Mirror Mode:
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Win all Gold trophies in all cups in the Retro Grand Prix 150cc class to unlock 
150cc Mirror Mode. 
 
Mission Mode mission 7:
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Get a 1 Star or greater rank on each level of missions 1 through 6 to unlock 
mission 7. 

Bonus karts:
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Win a Gold trophy in all cups in the Nitro Grand Prix in the 100cc class to 
unlock a third kart for all characters. Win a Gold trophy in all cups in the 
Nitro Grand Prix in the 150cc class to unlock a total of seven karts for all 
characters. Win a Gold trophy in all cups in the Retro Grand Prix in the 150cc 
Mirror Class to unlock all karts for all characters. 

Play as Daisy:
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Win a Gold trophy in all cups in the Nitro Grand Prix in the 50cc class to 
unlock Daisy. 

Play as Dry Bones:
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Win a Gold trophy in all cups in the Retro Grand Prix in the 50cc class to 
unlock Dry Bones. 

Play as R.O.B.:
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Win a Gold trophy in all cups in the Mirror Mode Nitro in the 150cc class to 
unlock R.O.B. 

Play as Shy Guy:
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Play a Download Play game against another player to have the option to play as 
Shy Guy. Note: Shy Guy can only be used Download Play mode. 

Play as Waluigi:
----------------
Win a Gold trophy in all cups in the Retro Grand Prix in the 100cc class to 
unlock Waluigi. 

Alternate ending sequence:
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Win all Gold trophies in all cups and classes to change the ending sequence. 

Star next to name:
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Win all cups in all classes with a 1 Star or greater rank for a star to appear 
next to your name in Multiplayer mode and on the "Records" screen.