You should bag around 70 kills per run, so keep at it. The Stat Tracker will keep you informed of how many kills you have accumulated. Once you've come to the end of the level (before you meet the final boss), reload the chapter and start again. You'll come across large groups of enemies on the ground, when you do fire your rockets at them to gain multiple kills. Work your way through the level firing your rockets and machine gun at every enemy possible. Load up Act 5, Chapter 5 (Aftermath, Closure) which will start you on the Brumak. For those who can't play the video, just follow these guidelines: You can either keep playing a bucket load of multiplayer and horde, or you can use the video below. If you followed this walkthrough you should be over 5,000, which means you have a mere 95,000 kills to get. The one that will no doubt take you the longest, and people who earned the Seriously achievement in the first Gears of War game will be very familiar with, is the Seriously 2.0 achievement. More like a distant brother to the Mulcher, an older chain gun from the first few games. The daddy of the Gears of War 2 achievement list. Another heavy weapon that sports incredible firepower is the Tri-Shot Chain Gun from recent Gears of War games.

Gears of war mulcher