Get Harder Mode

Finish the game 1 time

Get Legendary Dark Mode

Finish Hard Mode

Get Dante Must Die Mode

Finish Legendary dark Mode

Get Super Dante Mode

Finish Dante Must Die Mode

Get Shotgun

Okay in the Demo Version of DMC, u start off on Mission 2 over at the Cathedral. To get the shotgun here's what you have to do:
Go into that huge eerie looking library. Walk or jump upstairs.To up next to the only table you see up there. Now chop it up. Wait for the debris to clear. You should see the gun on the floor. To pick it up, stand next to it and press  the square button Congrats, you got the Shotgun

Beat Griffin

The first time you fight the Griffin is in the open field near the three doors that are locked, two by shield and the other with spears. To beat him just use Air Raid. It gets the job done really quick. The second time you fight him you HAVE to use Air Raid, it was the only way i could beat him. And the last time you fight him is in a open space again.

Extra Red Orbs

First you choose a simple level where you get alot of orbs,(I chose Level 3 Cause of the phantom). Then after you got all the orbs press select then save your game, then reset. play that same level over and over and each time you save and rest, you save the number of orbs, so you can buy cool stuff. it is time consuming and its not helpful on your rank on that level but it does make the game alot easier to complete.

Secret Mission Locations

1.Critical Hit-Mission 3-Go to the broken bridge and fall in.
2.Phantom Baby-Mission 4-Re enter the cathedral where you fought Phantom.
3.Phantom Baby-Mission 4-Enter the god of time room next to the biplane room.Defeat Phantom first.
4.Three beast-Mission 4-Enter the arena under the biplane room [you only have one chance to beat this secret mission]
5.One eyed evil-Mission 5-Re enter the room where the Beezelbub first appeared.
6.Wandering ghost-Mission 11-Re enter the area where mission 10 ended.
7.Water cell-Mission 13-Returne to the captains cabin and use the action button on his skeleton.
8.Treasure of the reaper-Mission 15-Returne to the area where you found the Sheild Emblem and examine the skull carved on the wall.
9.Stairway of Trainquility-Mission 16-Re enter the coliseum after you defeat the Griffon.
10.Shadow of Darkness-Mission 16-Re enter the biplane room after Nightmare is defeated.
11.Blue gem in the ski-Mission 17-Activate the Air raid and fly to the opposite side of the bridge but dont fall in the water.
12.Hidden Bangel-Mission 21-Examine the wall that the god of time faces.

Refill Vitality / Devil Trigger Gauge

Ok, the first time you beat the game on normal and play through the hard mode, you'll notice that enemies take a little more life when they attack... This also holds true for your first encounter with Nelo Angelo (the Dark Knight)... After you fight him for a while, he'll ascend one level to the next platform... Arm your grenade gun and shoot him through the niche in the wall where he's standing... You'll notice that he block every shot, but your devil triggers also recharge... Remember that you regain life while in devil trigger mode...? Engage your devil trigger and regain some life... You can just repeat the process until your life is completely full... This can also be done when Nelo Angelo ascends to the third level, but you may need to practice the positioning/aiming to hit him...

Beating enemies the Hard way!

When you are fighting Phantom take Alastor and keep jumping on his back and then slash him! When your Devil Trigger is full Go into the fly-around mode by pressing L1, jump and R1. Then keep firing. Do this as long as he's alive!

When facing Nelo, which is "very Hard" to beat, get the Ifrit on and keep jumping and then hit him. Make sure he won't hit you with the glowing balls he throws... When your Devil trigger is full go stand near him and press L1 and then hold R1. Now keep hitting him you will be 10 times faster then normal and he can't hit you, also avoid him when his sword is blue, he is planning an attack then. Also jump twice when you're on a wall and then hit him, the impact will be greater.

I'm not the greatest Hero off them all so I don't know how difficult Griffin is in the Hard mode but anyway get Sparda and keep slashing his blue glowing belly. And the rest you'll have to find out yourself about this character!!!

Mundus, the greatest fucker off them all! I hope you've done some flysims before because he is nasty!!! he will do anything to destroy you!!! Keep flying in rounds and also keep shooting on his hart. When he dies you get to the next level and then I've got to go!!! Sorry, more next time!!!

Easier ways to kill griffon

Before you fight griffon the second and third times you should have picked up the grenade launcher at least and maybe by the third time you will have nightmare weapon-B.
Don't use nightmare weapon-b on griffon cause it only wastes your devil gauge. Instead use the grenade launcher and change to devil mode, fire as many super-grenades as you can at griffon, then run in with the sword and slash it until your gauge fills up again, then run back and devil morph, and fires your grenades again to kill it.
You don't actually need air-raid, or any special airborne attacks, and jumping doesn't help to much as you can't fire grenades and jump.

How to beat Sparta

To beat Sparta you need to use the Alaster and the hand guns. When he is close to you use the sword and when he is not in the sword's range use the guns. you wwant to shoot very fast.
NOTE: don't use Air Rade. I made that mistake, he just blocks it with his sword.
NOTE: It is OK to use devil trigger form. That makes you chop him up alot faster.

Orbs -R- Us

A way to get unlimited orbs is to defeat all objectives in any level, but don't finish the level.  Save your game to your memory card (before finishing the level), go to the option menu and reset your game.  Then load the saved game and you will start the level over with the orbs you collected.  Do it as many times as you like.  The only catch is it will lower your grade once you complete the level.

Nightmare's weakness

Nightmare is really cheap right? Well heres a few good ideas when fighting the titan of terror. In your first fight with him use Holy Waters when he lets out his core to do a lot of damage(NOTE:tjis only works the first time you fight him).The other times you fight him make sure you have air raid with alastor and just blast his core when he lets it out stopping periodicly to keep his restaints on of course.And my last word of advice it to have inferno with ifrit and hit him in his core that to cause some serious damage although meteor is good inferno is a lot better.