When you complete the indicated task for the trophy you want to unlock you can view it in the Gallery section.

Unlock Winner's Pen Trophy:
Beat Kamek once

Unlock Yummy Lychee Trophy:
Beat Dry Bones once

Unlock Jagged Leaf Trophy:
Beat Piranha Plant once

Unlock Toadette's Chair Trophy:
Beat Hammer Bro once

Unlock Bowser's MegaMorph Belt Trophy:
Beat Bowser once

Unlock Electromagnetic Generator Trophy:
Beat Bowser twice

Unlock Delicious Durian Trophy:
Beat Dry Bones twice

Unlock Enchanted Bookcase Trophy:
Beat Kamek twice

Unlock Toadette's Timpano Trophy:
Beat Hammer Bro 3 times

Unlock Kamek's Brown Book Trophy:
Beat Kamek 3 times

Unlock Magic Switch Trophy:
Beat Dry Bones 3 times

Unlock Bomb Seed Trophy:
Beat Piranha Plant 3 times

Unlock Beaten Piranha Plant Trophy:
Beat Piranha Plant 4 times

Unlock Dry Bones's Bone Trophy:
Beat Dry Bones 4 times

Unlock Hammer Bro's Hammer Trophy:
Beat Hammer Bro 4 times

Unlock Kamek's Blue Dictionary Trophy:
Beat Kamek 4 times

Unlock Toadette's Piano Trophy:
Beat Hammer Bro twice

Unlock Winner's Ballon Trophy:
Beat Piranha Plant twice

Unlock Beaten Dry Bones Trophy:
Beat Dry Bones 5 times

Unlock Beaten Hammer Bro Trophy:
Beat Hammer Bro 5 times

Unlock Beaten Kamek Trophy:
Beat Kamek 5 Times

Earn the indicated amount of 'Party' points or complete Story mode with a certain character to get the corresponding badge.

Unlock Mario Party DS Beginner Badge:
You start with this badge.

Unlock Goomba Rival Badge:
Earn 1,000 Mario Party points.

Unlock Scuttlebug Rival Badge:
Earn 3,000 Mario Party points.

Unlock Cheep Cheep Rival Badge:
Earn 5,000 Mario Party points.

Unlock Boo Rival Badge:
Earn 7,000 Mario Party points.

Unlock Shy Guy Rival Badge:
Earn 9,000 Mario Party points.

Unlock Whomp Rival Badge:
Earn 11,000 Mario Party points.

Unlock Monty Mole Rival Badge:
Earn 13,000 Mario Party points.

Unlock Bob-omb Rival Badge:
Earn 15,000 Mario Party points.

Unlock Wiggler Friend Badge:
Earn 17,000 Mario Party points.

Unlock Toadette Friend Badge:
Earn 19,000 Mario Party points.

Unlock Daisy Master Badge:
Complete Story Mode with Daisy.

Unlock Luigi Master Badge:
Complete Story Mode with Luigi.

Unlock Mario Master Badge:
Complete Story Mode with Mario.

Unlock Peach Master Badge:
Complete Story Mode with Peach.

Unlock Toad Master Badge:
Complete Story Mode with Toad.

Unlock Waluigi Master Badge:
Complete Story Mode with Waluigi.

Unlock Wario Master Badge:
Complete Story Mode with Wario.

Unlock Yoshi Master Badge:
Complete Story Mode with Yoshi.

Instead of having to search for the hidden mini-games and playing them before they become an available option on the list you can link your DS with someone who has played Party mode and ALL the mini-games can be selected.

When you have completed Story mode the following features become available.

Unlock Expert CPU Difficulty Level:
Complete Story mode.

Unlock Triangle Twister Puzzle Mode:
Complete Story mode.

Unlock Music and Voice Room:
Complete Story mode.


Unlock Rocket Rascals Mini-Game:
Beat the Boss Bash mini-game to unlock Rocket Rascals where you build a bridge to your rocket (to play this mode you need to have unlocked ALL the mini-games).