Not possible to download as a single zip file using force.com application.

If you want cloud based only, you will need to integrate with another platform (Amazon Web Services, an external web server, etc) to send the attachments to that platform, then zip them on that platform, and then present the download/link from that platform.

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I am Sakthivel Madesh, a certified Salesforce Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 13x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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