Full list of all 70 Ninja Gaiden II achievements worth 1,250 gamerscore. It takes around 80-100 hours to unlock all of the achievements in the base game.
The base game contains 60 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 10 achievements worth 250 Gamerscore.
Finished walking the Path of the Master Ninja.
Finished walking the Path of the Mentor.
Completed the game using only the Dragon Sword.
Annihilated Alexei, the Greater Fiend of Lightning.
Annihilated Elizébet, the Greater Fiend of Blood.
Annihilated the High Infernal Priest, Dagra Dai.
Freed Genshin's soul and ended the reign of the Black Spider Clan.
Chose to continue the game 100 times.
Purified the site of the the ninth Test of Valor.
Obtained all of the Crystal Skulls.
Defeated 1000 enemies with Ultimate Techniques.
Purified the site of the the eighth Test of Valor.
Purified the site of the the seventh Test of Valor.
Purified the site of the the sixth Test of Valor.
Purified the site of the the fifth Test of Valor.
Purified the site of the the fourth Test of Valor.
Purified the site of the the third Test of Valor.
Purified the site of the the second Test of Valor.
Purified the site of the the first Test of Valor.
Defeated 1000 enemies with Obliteration Techniques.
Finished walking the Path of the Warrior.
Finished walking the Path of the Acolyte.
Annihilated Volf, the Greater Fiend of Storms.
Annihilated Zedonius, the Greater Fiend of Flame.
Defeated Genshin, leader of the Black Spider Clan.
Defeated the Greater Fiend Elizébet.
Obtained 20 Crystal Skulls.
Finished Chapter 9, "Heart of Darkness."
Achieved a 100-hit combo.
Defeated the Greater Fiend Zedonius.
Finished Chapter 7, "The Flying Fortress Daedalus."
Successfully mastered the Art of the Piercing Void Ninpo.
Defeated the Greater Fiend Volf.
Successfully mastered the Art of the Flame Phoenix Ninpo.
Obtained 10 Crystal Skulls.
Finished Chapter 5, "The Aqua Capital."
Defeated the Greater Fiend Alexei.
Finished Chapter 3, "Thunderclap of Catastrophe."
Successfully mastered the Invisible Path technique.
Successfully mastered the Art of the Wind Blades Ninpo.
Finished Chapter 2, "The Castle of the Dragon."
Successfully mastered the Unrivaled Soaring technique.
Successfully mastered the Counter Attack technique.
Finished Chapter 1, "Sky City Tokyo."
Successfully mastered the Furious Wind technique.
Successfully mastered the Shadowless Footsteps technique.
Successfully mastered the Ultimate Guidance technique.
Successfully mastered the Ultimate Technique.
Successfully mastered the Flying Swallow technique.
Successfully mastered the Flying Bird Flip technique.
Successfully mastered the Obliteration Technique.
Successfully mastered the Art of the Inferno Ninpo.
Successfully mastered the Reverse Wind technique.
Complete the game using only the Lunar Staff.
Complete the game using only the Falcon's Talons.
Complete the game using only the Dragon's Claw and Tiger's Fang.
Complete the game using only the Kusari-gama.
Complete the game using only the Eclipse Scythe.
Complete the game using only the Tonfa.
Complete the game using only the Vigoorian Flail.
Completed 4 Missions
Completed 8 Missions
Completed all Karma Attack Missions on Path of the Acolyte
Completed all Karma Attack Missions on Path of the Warrior
Completed all Karma Attack Missions on Path of the Mentor
Completed all Karma Attack Missions on Path of the Master Ninja
Obtained a Medallion in a Survival Mission
Obtained all Bronze Medallions in the Survival Missions
Obtained all Silver Medallions in the Survival Missions
Obtained all Gold Medallions in the Survival Missions