@jkantola - As far as I know, there is no way to see who has/has not approved when using an approval action and the "everyone" option.
As an alternative, you might consider individual approval actions for each approver running in parallel. When an approver approves or rejects, you can update a column in the SharePoint list to indicate who has approved. I have used a multi-line text box with "append changes" turned on for this purpose..
Post here if you need an example.
If this solves your issue, please mark your question as solved.
Scott