When you're in the milestones view of a report, it shows an elaborate
breakdown of tasks, milestones, and completion %'s (along with the start
and end dates) - shown in first screenshot. But when you send out the
report as PDF (or any other method), it only shows the project name,
owner, start on/due on, and completion %) - shown in 2nd screenshot. We
use milestones for every project and being able to share a report
showing these would be very effective.