As far as I know, only your 139 helpful moderator flags count for the badge; that is true for moderators as for the normal users.
That is what happen since January 20, when the flag weight has been replaced with useful flags.
It seems moderators cannot obtain any badge for the number of helpful flags: I have more than 500 helpful flags, but I don't have the Marshal badge. I am referring to the "moderation attention" flags, and to the number shown as, "deemed helpful."