How to Unlock the Party Like It's 1999 achievement in GOW2

Unlock the Party Like It's 1999 achievement in Gears of War 2 (gow2) for XBOX 360.

This guide is for the new GOW2 and shows you exactly how to cheat and get the achievement. Achievements are accrued in XBOX Live to show everyone how many games you've beat over time. Join Delta Squad and the legion of COGs as they fight the Horde in this war for energy reserves. This is a combat game exclusively for XBOX 360. Gears of War 2 is a tactical third-person shooter video game developed by Epic Games and published by Microsoft Game Studios for Xbox 360.