Story (Unmissable) Trophies
Important note: All of these are story based and cannot be missed provided you progress through the entire story mode. The game is pretty darn easy and the game guides you whenever you're stuck, so no specific advice is really needed.
Off You Go
Completed basic training
Found Futo
Find Futo
Found Suzume
Find and free Suzume
Found Shun
Find and free Shun
Found Kunoichi
Find and free Kunoichi
Found Tora
Find and free Tora
Lost and Found
Retrieve all five missing ninja
Off the Richter Scale
Defeat Boss Lumbering Fool
Smell You Later
Defeat Boss Windy Pants
Tripped and Fell
Defeat Boss Timid Swimmer
Crash Landing
Defeat Boss Screeching Owl
Restore Balance
Defeat the Evil Samurai Warlord
Little Ninja
Complete game on easy or medium difficulty
All Other Trophies
Tree Hugger
Shake 15 trees
Any fruit-bearing bush or tree you can shake (literally, if you're using the sixaxis controls). Shake 15 distinct fruit-bearing trees and this trophy is yours. Unfortunately, bushes do not count. There are plenty of fruit-bearing trees throughout this game. So, no real hunting needed here.
Avalanche
Defeat an enemy as a snowball
This is done in the level "Snowy Canyon" and is best attempted just after the first checkpoint. You will be given instruction about how to jump just after this checkpoint. If you jump over the chasm you'll see your first set of enemies. Don't worry about these guys. Just further down, there will be two more sets of enemies. These are the ones you want to focus on. You want to veer into a tree little before you approach these enemies. By doing so, you will cause Hiro to roll and accumulate snow. If he rolls enough, he'll become a snowball. While a snowball, you want to hit an enemy. This can be a little tricky and may take a couple of attempts.
Important note: It is much easier to navigate with the sixaxis controls turned OFF. You can turn these off in the options menu. Just be sure not to mess with your difficulty setting.
Smooth Sailing
Flawless Great River Canyon rafting
This is done on the level "Great River Canyon". Towards the end of the level, you will have to do two rafting sections. There will be rocks in the water that can damage your bowl hat. The amount of damage you've taken is indicated in the upper right of the screen. Get through these rapids without any damage and the trophy will unlock. To make it easier to navigate, you should back pedal so that your speed is decreased. It has been suggested that you cannot hit a single thing on your rafting run, but I'm not entirely sold on this since I definitely skimmed a rock without taking any damage and the trophy still unlocked for me. There's a checkpoint right before, so you can reload until you get the trophy.
Bow Before Me
Defeat 50 enemies with the bow
One of your playable ninjas is Shun and the bow is his weapon. Just defeat 50 enemies with him and this trophy is yours.
Eat My Dust
Travel far in full gallop
One of your playable ninjas is Tora and his special ability is a sprinting attack. To get this trophy, you have to use this special move a certain number of times. (According to jefxfree, you don't even need to hit any enemies.) I recommend not activating the special move until your sprint meter is full, as this determines how long you can sprint for. Also, be sure to keep the special move activated until you've used all of your sprint meter. You keep the special move active by holding down Triangle.
Pied Piper
Incite 50 enemies to dance
One of your playable ninjas is Suzume and her special move is to make ninjas dance as she plays her flute. Whenever you encounter a mob of enemies, activate this special move and the trophy will unlock in no time.
Poker
Defeat 30 spearmen with the spear
One of your playable ninjas is Kunoichi and her weapon is the spear. Your samurai enemies either use swords, bows or spears. You have to defeat 30 of the spear ones with Tora for this trophy. The level "Final Approach" has two groups of spear equipped enemies fairly early in the level. Defeat these two groups while running past everyone else, find a check point and then quit. Now, wash and repeat until the trophy pops. Alternatively, you can just use Tora in your normal progression whenever you see spear enemies.
Don't Blame it on the Sunshine
Bring sunshine to all the denizens of the graveyard
In the level "Haunted Forest", you will come across a graveyard where you learn a sunshine spell. Use this spell to defeat all of the enemies in the grave yard. You can only defeat these ghost with this spell.
No Conjurer of Cheap Tricks
Expend 1500 Ki using Kuji magic
This will almost definitely come naturally as you progress through the game, since you'll be using magic fairly regularly. Obviously, if you need to farm this, just use magic. The graveyard in the "Haunted Forest" level is a decent place to go back to if necessary, since you can only defeat the ghost with magic and, once defeated, they drop more Ki.
Big Guy
Defeat a large one
You encounter large samurais in various levels. As far as I know Futo is the only one that can take them down. Just use him to defeat one and you'll get the trophy.
Boardom
Defeat 10 enemies as the boar
Boars are among the wild animals you will come across. Use your spirit possession spell to take control of one. Once you have control, use the boar to defeat 10 enemies. There is a boar next to Suzume when you free here in the level "Leaving Home".
Bear With Me
Defeat 10 enemies as the bear
Bears are among the wild animals you will come across. In the level, "Leaving Home" you will actually be told to take possession of a bear to defeat some enemies. Just continue to use the bear until the trophy unlocks.
Sightseeing
Visit all temples
These are not hard to find and often you come across the temple as you're completing some other mission objective. There are six temples total and they are located in the following levels:
- Leaving Home
- A Distress Signal
- Grassy Hills
- Flooded Valley
- Winter Range
- Volcano's Shadow
Some people seem to think that this has to be done in a single play-through and can't be completed via level select. I don't know for sure, but I would just make sure you get these as you go along to be safe.