Full list of all 35 Mini Ninjas achievements worth 1,000 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox 360.
Use Futo in combat on all levels
Free all caged animals
Reach level cap
Complete all Wandering Tengu quests
Flawless Great River Canyon rafting
Travel far in full gallop
Complete a level without being seen
Complete game on easy or medium difficulty
Defeat the Evil Samurai Warlord
Complete game on hard difficulty
Collect all Jizo statues
Defeat 30 spearmen with the spear
Visit all temples
Defeat an enemy as a snowball
Defeat Boss Screeching Owl
Defeat 100 enemies with stealth attack
Incite 50 enemies to dance
Retrieve all five missing ninja
Find and free Kunoichi
Defeat 10 enemies as the bear
Collect one of each ingredient
Defeat Boss Timid Swimmer
Defeat 10 enemies as the boar
Shake 15 trees
Find and free Tora
Defeat Boss Windy Pants
Bring sunshine to all denizens of the graveyard
Defeat 50 enemies with the bow
Find and free Shun
Expend 1500 Ki using Kuji magic
Defeat Boss Lumbering Fool
Defeat a large one
Find and free Suzume
Completed basic training
Find Futo