Gears of War
50 Achievements
1,000
Xbox 360
Shock Therapy
Defeat a Brumak on Hardcore Difficulty Details for this achievement will be revealed once unlocked
30
How to unlock the Shock Therapy achievement in Gears of War - Definitive Guide
In the PC version of the game you will be able to fight the Brumak as a boss. The Brumak is the giant creature with a large gun mounted on his(her?) back
If you're still with me, just shoot the arm guns until they blow up, then shoot the Brumak's feet so he falls down, exposing the driver. Shoot the driver for a bit and the Brumak will get back up. Rinse and repeat until the driver is dead. Then you get a cutscene and the achievement.