Here is the full list of all 36 Mini Ninjas trophies - there are 21 bronze, 9 silver, 5 gold and 1 platinum.
Congratulations, you have unlocked all trophies
Use Futo in combat on all levels
Travel far in full gallop
Complete a level without being seen
Flawless Great River Canyon rafting
Bring sunshine to all the denizens of the graveyard
Collect all Jizo statues
Complete game on hard difficulty
Complete game on easy or medium difficulty
Defeat the Evil Samurai Warlord
Free all caged animals
Visit all temples
Defeat 30 spearmen with the spear
Defeat an enemy as a snowball
Defeat Boss Screeching Owl
Reach level cap
Retrieve all five missing ninja
Find and free Kunoichi
Defeat 100 enemies with stealth attack
Collect one of each ingredient
Complete all Wandering Tengu quests
Defeat Boss Timid Swimmer
Incite 50 enemies to dance
Find and free Tora
Defeat Boss Windy Pants
Defeat 50 enemies with the bow
Find and free Shun
Defeat Boss Lumbering Fool
Defeat a large one
Defeat 10 enemies as the boar
Expend 1500 Ki using Kuji magic
Find and free Suzume
Defeat 10 enemies as the bear
Shake 15 trees
Completed basic training
Find Futo