Achievements disabled on a world that didn't have cheats or creative mode enabled.

A survival minecraft world, named "Caden's World (1)" on my xbox suddenly had achievements disabled within the last few days, however, I had not entered creative mode, activated cheats, experiments, etc. The following message pops up when going into the world details:

"You can't earn achievements. You will not be able to earn achievements in this world with your current settings. If you would like to earn achievements, change these settings:"

(No text or settings are listed)

 

I have put countless hours and effort into this world with intent to beat the "End" with my friends 100% on survival mode, while earning multiple achievements along the way. 

 

Please help me re enable achievements on this world so I don't feel as though the hard work on survival up to this point has been for nothing. Currently, I am losing motivation to continue playing Minecraft as I am hurt to know that I may be left to start all over to get achievements again. Thank you for you help.