Originally Posted by
GMJeff as they thought it would confuse people and make them think the phone was an extension of the xbox console.
Which it really could be if they put in the effort. I wasn't aware Xbox achievements could be collected on Windows Phone for a long time.
Anyway, the latest on OTG from the Microsoft website:
Windows supports many devices, including keyboards, mice, hubs, storage, audio (such as speakers and headsets) and Bluetooth dongles.
Some other devices, such as the Arduino, are also supported. Check with the device manufacturer to see if your device is supported.
To see if your Windows 10 Mobile device supports USB device connections, select Start, enter Settings, select Settings from the list, select Systems > Devices > USB.