Plain reports are reports without any style to let you style them or place anywhere.
Points Report
There is an example showing the Energy earned:
Reminder! The shortcode version of this block is the [gamipress_frontend_reports_points] shortcode.
Achievements Report
There is an example showing the Badges earned:
Reminder! The shortcode version of this block is the [gamipress_frontend_reports_achievements] shortcode.
Ranks Report
There is an example showing the Grades earned:
Reminder! The shortcode version of this block is the [gamipress_frontend_reports_ranks] shortcode.