public IActionResult Delete(Guid id)
        {
            var item = _UserAchievementService.AsQueryable()
                       .Where(x => x.Id == id)
                       .FirstOrDefault();

            if (item is null)
            {
                return(NotFound());
            }

            _UserAchievementService.RemoveUserAchievement(item);

            return(Ok());
        }