Clearing Acquia Varnish Cache when any content gets updated
Not sure if this module would work for you, https://www.drupal.org/project/acquia_flush_varnish

Another module that you could check, https://www.drupal.org/project/acquia_purge

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If neither one works, you can leverage Acquia's API. 


Here's some info on Varnish from Acquia, https://docs.acquia.com/cloud/performance/varnish
Here they talk about the endpoint, https://docs.acquia.com/cloud/performance/varnish/purging#api



  DELETE /sites/:site/envs/:env/domains/:domain/cache


An example from them, 


  curl -s -u user:pass -X DELETE \
  https://example.com/v1/sites/site/envs/prod/domains/example.com/cache.json



A example that only resets a specific page is listed here, https://docs.acquia.com/cloud/performance/varnish/manually-purge



  # Replace 'sitename' below with the appropriate value.
  curl -X PURGE -H "X-Acquia-Purge:sitename" -H "Accept-Encoding: gzip" http://example.com/path/to/page


A module that executes that when saving nodes, or a particular content type, should be easy.