Dark Sector - Brutal Difficulty 110G
Complete the Game on Brutal Difficulty.

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After finishing the game once, on the single player menu a new option "New Game Brutal Difficulty" will be available. Just play through on Brutal but be more careful and take your time, as you will take more damage and enemies will be tougher.

During the single player campaign, the cornering trick can be very helpful to take out enemies and avoid damage, especially on the brutal difficutly. Position yourself on the side of a crate or wall or something solid so that an enemies bullets can't hit you, but you can still lock them in your reticle. As long as the enemy is in your sights, you can fire and hit it, regardless of whether or not your gun is behind cover. Use this to aim for headshots and enemies in the open to conserve ammo.

Another quick tip is to not rely on ONLY the glaive, or ONLY your guns. Use both of them where you see necessary. The glaive is powerful when used right, but isn't exactly rapid firing. Use the power throw to one shot kill enemies behind cover when they pop out, or use the aftertouch to steer around corners to enemies that can't see you. Use your guns with the cornering technique for safe kills, and feel free to bullet hose enemies with their own guns, as they don't use your own ammo and have a limited timer on them.

There is a youtube walkthough located HERE and a text/picture walkthrough located HERE that should help you with any parts you may be stuck at.

Warning: There is a small glitch that for some reason the game will revert to Normal mode after chapter five sometimes. It doesn't happen to everyone, but after each level it is suggested to go to the main menu and check the "Load Game" part and make sure it says "Brutal" under the level name. If it does, go ahead and use "Continue" but if it doesn't, select the previous chapter and play it again, this should update the next level to Brutal. Keep trying until it does, then finish the game.