"Pass over/under objects" is an optional mission objective in Sequence 1 / Memory 01: Memories of Versailles
Walkthrough
During your chase of Hugo, you will see an on-screen prompt on how to run through or over objects in your path. Over the course of this memory, you need to go over or under 5 objects that are in your way. This is very easily done during the Hugo chase. Just hope the Free-run Down button as you chase Hugo through the city streets.
This counts going over or under tables. It also counts going through windows.