Achievements are all the rage these days. All the cool kids are getting them, so you probably don't want to feel left out, do you? Luckily Halo Wars for the Xbox 360 includes these little doohickeys at no cost to you...and best of all? You'll spot some co-op friendly achievements upon entering the battlefield.
Perhaps completing the entire campaign with a friend entices you to 40GP? Oh, there's more, but you'll have to keep reading to find out.
|Complete any Campaign Mission in Co-op Mode
|OMG BFF FTW
|Complete entire Campaign in Co-op Mode
Ok, so perhaps "more" was the wrong word, but at least there's two. Click the source link below to see the full list of achievements, co-op and otherwise.