There are 47 COG tags hidden throughout the game in Gears of War: Judgement on the Xbox 360.
Personally, I don’t have the time to find all of them, but luckily other people do.
A user named Da-Ruler (nice name bro) on GameFaqs has such time, and was nice enough to write up a guide for all of us.
It’s a pretty nice guide, with good descriptions, so check out the guide here.
He also made a video guide to go along with it which you can find here.
Be sure to check out my other stuff though, like my complete list of cheats, unlockables, tips, guides, and more.
Also, if you didn’t pre-order your game in time, check out all of the Gears of War: Judgement DLC on Ebay.
