Edit in JSFiddle

Highcharts.chart('container', {

    chart: {
        type: 'bubble',
        plotBorderWidth: 1,
        zoomType: 'xy'
    },

    legend: {
        enabled: false
    },

    title: {
        text: 'Impact vs Effort'
    },

    subtitle: {
        text: 'All Your Base Are Belong To Us'
    },

    xAxis: {
        gridLineWidth: 1,
        title: {
            text: 'Effort'
        },
        labels: {
            format: '{value}'
        },
        min: 0,
        max: 100,
        tickInterval: 10,
        plotLines: [{
            color: 'black',
            width: 2,
            value: 50,
            label: {
                rotation: 0,
                y: 15,
                style: {
                    fontStyle: 'italic'
                },
                text: 'Effort'
            },
            zIndex: 3
        }]
    },

    yAxis: {
        title: {
            text: 'Impact'
        },
        labels: {
            format: '{value}'
        },
        min: 0,
        max: 100,
        tickInterval: 10,
        maxPadding: 0.2,
        plotLines: [{
            color: 'black',
            width: 2,
            value: 50,
            label: {
                align: 'right',
                style: {
                    fontStyle: 'italic'
                },
                text: 'Impact',
                x: -10
            },
            zIndex: 3
        }]
    },

    tooltip: {
        useHTML: true,
        headerFormat: '<table>',
        pointFormat: '<tr><th colspan="2"><h3>Project: {point.project}</h3></th></tr>' +
            '<tr><th>Effort:</th><td>{point.x}</td></tr>' +
            '<tr><th>Impact:</th><td>{point.y}</td></tr>' +
            '<tr><th>Cost:</th><td>{point.z} Million</td></tr>',
        footerFormat: '</table>',
        followPointer: true
    },

    plotOptions: {
        series: {
            dataLabels: {
                enabled: true,
                format: '{point.id}'
            }
        }
    },

    series: [{
        data: [
            { x: 80.8, y: 91.5, z: 29.8, id: '102', project: 'Alpha' },
            { x:  8.4, y: 70.1, z: 25.6, id: '201', project: 'Beta' },
            { x: 10.0, y: 93.2, z: 25.7, id: '320', project: 'Delta' },
            { x: 28.6, y: 20.5, z: 26.2, id: '340', project: 'Gamma' },
            { x: 65.5, y: 22.4, z: 35.3, id: '501', project: 'Omega' },
            { x:  5.4, y: 30.8, z: 28.5, id: '504', project: 'Eta' },
            { x: 63.4, y: 51.8, z: 25.4, id: '506', project: 'Sigma' },
            { x: 64.5, y: 82.9, z: 31.3, id: '330', project: 'Omicron' }
        ]
    }]

});

.highcharts-tooltip h3 {
    margin: 0.3em 0;
}

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/highcharts-more.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="height: 500px; width: 500px; margin: 0 auto"></div>