public async Task <ActionResult> AddAchievementToUser(Guid AchievementId, Guid UserId, CancellationToken Cancel)
        {
            try
            {
                await AchievementService.AddAchievementToUser(AchievementId, UserId, Cancel);

                return(Ok());
            }
            catch
            {
                return(BadRequest());
            }
        }