Ninja Gaiden Black

Comic: Complete the game under the Ninja Dog or normal difficulty settings.
Dead Or Alive: Complete the "Special" mission.
Red Muffler: Complete the game under the hard difficulty setting.
Ryuken: Complete the game under the very hard difficulty setting.

Save the game while in Ninja Dog difficulty. Load that saved game file, then hold Start + Back to perform an in-game reset to see an Ayane-themed title screen.

Turn in 50 Scarabs to Muramasa at the shop under the Ninja Dog difficulty setting.

Successfully complete the game.

Go into the room where you get the second Jewel of The Demon Seal. Kill the first 30 Beetles, then leave the room and return. There is a challenge where you can kill 60 Beetles. Kill about 57 to 58 beetles, then leave the room. Keep repeating the process to get a lot of Essences. Once you leave the room, you can run to the shop and upgrade your weapons. Continue the process until you have upgraded all the weapons you have. Once you have upgraded everything, spend the rest on supplies or armlets. After that, return to the same room that the Beetles. Kill all 60 Beetles to unlock a chest which contains a Talisman Of Rebirth.

On Chapter 12 "The Aquaduct", when you reach the point where there is a save point near the main door (which leads a huge statue of the girl, one with three water weights around her), save the game. Turn around and face where you came from. Take a few steps and turn to the left path. You will see a small door, like a elevator. Go in there. Press L2 to bring up your Karma display. The first time you go in, kill all the Scorpion-looking things and remember the total number killed. This number will appear on your Karma display. Return outside and save the game if desired. Go back in and do not kill all them. Leave when there are two to four of them remaining. Go back in and they will appear again. Repeat this as many times as desired.

Accumulate over one hour of game play.

Dodge all his attacks and wait for him to kneel down and charge at you. As soon as he charges, move to the left or the right. As soon as the animation is done, he will be vulnerable. Attack him with a combo and roll away. Repeat this as many times as needed.

If you have the Dabilahro at level 2 or 3, equip it and the armlet that makes Ultimate Techniques charge faster. When the battle starts, Doku will do the attack where he hits the ground with his sword and a blue wave is produced. Evade this first one then charge for an Ultimate Technique. When he hits the ground again with his sword, release the Technique. By doing this you will evade the wave and at the same time attack him. Make sure to remain far enough for him to perform the attack; sometimes he throws his sword at you. Just evade it and continue with the strategy. Repeat this until he is defeated. For harder difficulties, kill his minions first then follow the strategy.

This is a very easy Boss if you know how to deal with him. First, use the Dragon Sword. Be careful of the mages that attack you. Evade their attacks and kill some of them for essence, then perform a charged Ultimate Attack on Makasado. Make sure to roll when he is about to attack or you will get damaged.

To defeat the bone bird after the worms, equip the Dragon Sword and the Armlet Of The Sun if available. The only time you should attack is when its on the left side of the field. As soon as the battle starts, roll jump into the bottom right side of the field and block. This will protect you from its attacks. As soon as he starts running to the other side, jump roll towards him and use the Flying Swallow attack as soon as he is in front of you. You will go through him and land behind him. Get directly behind his rear and start attacking him. When he jumps, block. When he lands, start attacking him again. The X, Y, X(4) combo works very well. Keep doing this and when he lowers his head, attack it.