Chart reports are reports to display statistics of the different types and amounts you want like a chart with the earned and lost “Credits” or a chart with achievements earned of all types.

Actually, chart reports support a total of 8 different styles: inline, lines, bars, horizontal bars, radar, doughnut, pie and polar area.

The chart reports shortcodes are:
[gamipress_frontend_reports_points_chart]
[gamipress_frontend_reports_points_types_chart]
[gamipress_frontend_reports_achievement_types_chart]
[gamipress_frontend_reports_rank_types_chart]

Also, is recommended to check this page to meet all features provided on those reports.