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CREATE table #yourtable
    ([Id] int,[Group] int, [Value] varchar(6), [ColumnName] varchar(13))
;
    
INSERT INTO #yourtable
    ([Id],[Group], [Value], [ColumnName])
VALUES
    (1,1, 'John', 'FirstName'),
    (2,1, '2.4', 'Amount'),
    (3,1, 'ZH1E4A', 'PostalCode'),
    (4,1, 'Fork', 'LastName'),
    (5,1, '857685', 'AccountNumber'),
    (6,2, 'Pedro', 'FirstName'),
    (7,2, '5.1', 'Amount'),
    (8,2, '123456', 'PostalCode'),
    (9,2, 'Torres', 'LastName'),
    (10,2, '857686', 'AccountNumber')
;
;



DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX)

select @cols = STUFF((SELECT ',' + QUOTENAME(ColumnName) 
                    from #yourtable
                    group by [Group], ColumnName, id
                    having [group] = (SELECT TOP 1 MIN([Group])FROM #yourtable)
                    order by id
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


        

set @query = N'SELECT ' + @cols + N' from 
             (
                select value, ColumnName,[Group]
                from #yourtable
                GROUP BY [Group],ColumnName,Value
            ) x
            pivot 
            (
                max(value)
                for ColumnName in (' + @cols + N')
            ) p '



exec sp_executesql @query;

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created may 21 anonymous