Story-Based Achievements
You will automatically earn the 13 achievements worth 260 gamerscore points by playing through and completing the game. You will get five achievements by finding and freeing each of the five missing ninja (as well as a sixth achievement for getting them all). Earn five achievements by defeating the bosses at the end of some levels, including Lumbering Fool, Windy Pants, Timid Swimmer, Screeching Owl and the last foe, Evil Samurai Warlord.
Plant and Animal Lover
The game contains 195 trapped animals. You must find and free all of them from their cages to unlock the 100-point achievement "Animal Friend." You can also score an additional 10 points by shaking 15 trees to unlock the "Tree Hugger" achievement. Find Spirit Form scrolls to transform into other animals. You can unlock 10-point achievements by defeating 10 enemies as a bear or boar.
A Little Help from Friends
Use the ninjas you've saved to help you earn more gamerscore. Kill 50 foes with Shun's bow to get the 20-point "Bow Before Me" achievement. Use Futo at least once in every level to earn the 20-point "Stop! Futo Time!" achievement. Take out 30 enemies with Kunoichi's spear to unlock "Poker," which is worth 10 achievement points. Switch to Hiro and expend 1,500 Ki with Kuji magic to earn a 20-point achievement called "No Conjurer of Cheat Tricks."
Miscellaneous Feats
Finish the game on easy or medium difficulties to earn 50 achievement points and complete the game on hard to add a 100-point tally to your gamerscore. Use the stealth attack to take down 100 enemies to get the 40-point "Now You See Me..." achievement. Finish a level without being spotted to get 50 points. Try completing this one on Level 5. Collect all of the dozen ingredients in the game to unlock "Botanist," which is worth 30 points.