@KF nope, The console has to be connected to the internet to detect that a patch is out. If it can't detect that then it can't force you to wait to DL before you can play. If you have low caps or low speeds I suggest anyone keep it disconnected from the net and only connect when you really need to get patches etc
@Lurch updates work differently on Xbox, you updating the game not downloading an update file like the PS4. Once you start updating an Xbox game you are committed hence pausing is only useful if you want to update at midnight etc.
@Marko - just keep the X1 updated, X1 game discs don't have system updates. This was an issue in the past, maybe it changed but a disc will not install if the system requirement of the game was higher than that installed on the console. You will now this as the installation will stop at 0%.
Achievements are supposed to 'sync' when you go online but rarely do.
@Marko - Yeah, it should be fine. Only thing I'd be careful of is agreeing to update and then cancelling out of it. To the best of my knowledge, it will actually delete all the game data, not revert back to the previous version (my 90GB install of Gears 4 disappeared that way).
@Marko - So long as your Xbox One is set up as your "Home" console, you should be able to play games without being connected., irrespective of the system or game version. The only issue might be if you were connected, the game/hardware was flagged as needing an update, and then you went offline.
The Xbox One always asks if you want to update. You can pause an update but you can't play connected to XBL if the game is not updated. Hopefully your X1 is updated as an installation will stop if the game requires a later X1 update.
Achievement will also not work properly if at all when the game is played offline.