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 Chapter 1, "Sky City Tokyo."
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 Furious Wind technique.
Successfully mastered the Reverse Wind technique.
Successfully perform the Counter Attack technique.
Successfully perform the Unrivaled Soaring technique.
Successfully perform the Invisible Path technique.
Successfully perform the Art of the Wind Blades Ninpo.
Successfully perform the Art of the Flame Phoenix Ninpo.
Successfully perform the Art of the Piercing Void Ninpo.
Defeat Alexei in battle.
Defeat Volf in battle.
Defeat Zedonius in battle.
Defeat Elizébet in battle.
Defeat Genshin in battle.
Complete the game on the Path of the Acolyte.
Complete the game on the Path of the Warrior.
Complete the game on the Path of the Mentor.
Complete the game on the Path of the Master Ninja.
Obtain 10 Crystal Skulls.
Obtain 20 Crystal Skulls.
Obtain all of the Crystal Skulls.
Achieve a 100-hit combo with any weapon.
Defeat 1000 enemies using Obliteration Techniques.
Defeat 1000 enemies using Ultimate Techniques.
Complete the game using only the Dragon Sword.
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.
Purified the site of the the first Test of Valor.
Purified the site of the the second Test of Valor.
Purified the site of the the third Test of Valor.
Purified the site of the the fourth Test of Valor.
Purified the site of the the fifth Test of Valor.
Purified the site of the the sixth Test of Valor.
Purified the site of the the seventh Test of Valor.
Purified the site of the the eighth Test of Valor.
Purified the site of the the ninth Test of Valor.
Finished Chapter 2, "The Castle of the Dragon."
Finished Chapter 3, "Thunderclap of Catastrophe."
Finished Chapter 5, "The Aqua Capital."
Finished Chapter 7, "The Flying Fortress Daedalus."
Finished Chapter 9, "Heart of Darkness."
Annihilated Volf, the Greater Fiend of Storms.
Annihilated Zedonius, the Greater Fiend of Flame.
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.
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