Gears of War 3

C H A P T E R 1
| U N B R E A K A B L E |
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==[OBJECTIVE: Defend the Front Gate]==
Now you'll see why I like to save my weapons between chapters. Go up the steps and follow all around until you get to the Front Gate. You'll find quite a lot of weapons on the way, including a One Shot at the front. A ton of grubs and Reavers will try their utmost to break through. Use the Hammer of Dawn on the little guys, and the One Shot on the Reavers and Grinders.
==[OBJECTIVE: Defend the Second Gate]==
After a few minutes a siege beast will destroy the first gate. Retreat back to the second walkway where everyone else is, and pick up your first taste of the Vulcan Cannon. It will turn everything into mincemeat, but it requires two people to operate it and you can't take cover with it, so expect to get shot a lot. After a few minutes Maulers will indefinitely spawn until you let them get the second gate.
==[OBJECTIVE: Defend the Inner Courtyard]==
Same song and dance as Gate 2, except Boomers will take the place of Maulers. No matter how many you kill, eventually they will break the door of the garage where you first started the chapter. Once you fight them for long enough, Hoffman and Bernie will tell you of 'Last Resort': Shooting a gas tank near Gate 2 that will completely block off the Locust. Follow your marker and shoot the Gas Tank to end this chapter.

Thanks to GameFAQS for the Guide and YouTube: specifically Howcastgaming for the video guides!

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Long Live The Cog!!

Play the campaign on any difficulty to get this achievement, playing with a buddy will also get you the co-op achievement. So play Act 3 Chapter 1