By now you likely have a small OPM subject sitting around — Serbia, Bosnia, or similar — that's ready to be diplo-annexed. If you've played Austria before you've probably already popped this achievement in a previous run. Either way, this is a natural checkpoint to clean it up if it hasn't triggered yet.

By now you likely have a small OPM subject sitting around — Serbia, Bosnia, or similar — that's ready to be diplo-annexed. If you've played Austria before you've probably already popped this achievement in a previous run. Either way, this is a natural checkpoint to clean it up if it hasn't triggered yet.