Exclude attachment urls from Google index

Hello,

We have several pages with a list of attachments.
We have excludes these pages from the search results in Google.
But for some reason the names of the attachments pop up on Google search results.

Is there a way to exclude the attachments urls form Google Search results?
For example: https://pvanleeuwen.nl/a190010-amerfoort-nieuwbouw-bedrijfshal-kringtex/12-kringtex-installatie/

Thanks in advance.

Jos