If you’re planning to be in an area with no online coverage, such as on a long-distance flight or a sailing excursion, you can prepare your Windows 10 device to allow you to play offline. Most games available in the Store on your Windows 10 device support offline play, but check the details of the game to make sure yours is supported by searching for your game at Xbox | Official Site
Most games with a campaign mode will be playable offline, but games with network co-op or multiplayer features will not work while you’re offline.
While playing offline, some features, such as the ability to purchase additional items from the Windows Store, will not be available. Additionally, any leaderboards will be unavailable while you're offline.
If you earn any achievements while playing offline, they will sync to your account the next time you sign in to Xbox Live on your device. You won’t see a toast notification letting you know that you unlocked the achievement until you sign in to Xbox Live on that device.
Cloud saves and offline game play
Before you go offline, connect to Xbox Live to sync your most recent game save to the cloud. While you play offline, your game save progress will continue to be saved locally, and it’ll sync the next time you sign in to Xbox Live. If you want to continue playing on a different device (or platform, if the game supports Xbox Play Anywhere), you’ll need to go online and connect to Xbox Live to allow your local saved game to sync with the cloud again.
If you’re on a Windows 10 device, your cloud saves will automatically start uploading once you’re signed in and connected to Xbox Live. Game save sync is usually fast, but allow a couple of minutes before you try playing on another device.
For more information, see: Play Games Offline on Windows 10 Using Offline Mode | Xbox Games
This tutorial will show you how to turn on or off offline permissions in the Store to play games offline on your Windows 10