"Only few actions are shown for the selected task as Account field is not present"

Ian,

The opportunity has to have a field that references the account the opportunity is associated to. Add that to the list of fields you are brining in and should fix your issue.

Thank you both, and thank you Swaroop for naming the specific field I needed. I understand now and appreciate your help

Hi Ian,

To expand a bit on Marcelo's comment–

There's a dropdown menu called [i]Account Lookup towards the bottom of the screenshot in your post. This dropdown is how you inform the rule your making where to look for the SFDC Account ID. If the source for Account ID in your "Show" fields does not match the source for Account ID in the "Account Lookup" section, you'll get the prompt "Only a few actions are shown..." 

Looking at the screenshot provided, I'm not sure the two match. i.e. The Account ID in your "Show" fields was selected from the Account section of the available fields (Account > ID) and the "Account Lookup" section is looking for the Account ID from the Opportunity section of the available fields (Opportunity > Account ID).  

To update this rule so that all of the actions are available in "Setup Action", you can either change the selection in the "Account Lookup" section, or simply add the Account ID field from Opportunity (stared in screenshot below).

Hope this helps :)

Cheers,
Pele