Evolve Receives Update 1.1
Turtle Rock has patched up Evolve on Xbox One, solving a number of issues like progress and save data errors.Some players have reported that they lost their progress and unlocks on Xbox One, but Update 1.1 should be solving the problem.
If you still encounter any issues, 2K Games recommends you to contact their support team. You can do it through here.
EVOLVE UPDATE 1.1 – PATCH NOTES
Source: 2K Support