Dr Womburger said:Does anyone know why The Orange Box achievements i got, didnt count for this target?
You unlocked them "offline" so they don't count.
If you're using backwards compatibility to play the game, it's advised to start an Xbox party in the Xbox 360 emulator so it notifies you if you've been disconnected from Xbox Live. Otherwise you have no way of knowing and they'll all be tagged as "Offline".