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