public bool Equals(CompletedAchievement other)
        {
            if (ReferenceEquals(null, other))
                return false;

            if (ReferenceEquals(this, other))
                return true;

            return other.Guid.Equals(Guid);
        }
        public bool Equals(CompletedAchievement other)
        {
            if (ReferenceEquals(null, other))
            {
                return(false);
            }

            if (ReferenceEquals(this, other))
            {
                return(true);
            }

            return(other.Guid.Equals(Guid));
        }