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
Free all caged animals
Collect all Jizo statues
Use Futo in combat on all levels
Defeat 100 enemies with stealth attack
Travel far in full gallop
Complete a level without being seen
Flawless Great River Canyon rafting
Complete game on hard difficulty
Complete game on easy or medium difficulty
Defeat the Evil Samurai Warlord
Defeat an enemy as a snowball
Visit all temples
Defeat Boss Screeching Owl
Defeat 30 spearmen with the spear
Reach level cap
Retrieve all five missing ninja
Find and free Kunoichi
Defeat 10 enemies as the boar
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
Bring sunshine to all the denizens of the graveyard
Shake 15 trees
Find and free Shun
Expend 1500 Ki using Kuji magic
Defeat Boss Lumbering Fool
Defeat a large one
Find and free Suzume
Defeat 10 enemies as the bear
Completed basic training
Find Futo