I require a pdf to be fully accessible however when I tick the ISO 1-9000 box before creating a pdf from a word doc, the pie chart (from excel) in that word doc get pdf-ed with blackhalos around them anyway this can be solved.
I am not familiar with the ISO 1-9000 box, but if by "fully accessible" you mean compliant with WCAG 2.0 and ISO 14289 (PDF/UA), auto-tagging will not get you there. You will need to manually remediate the document for accessibility in Acrobat Pro anyway, so you might as well convert to PDF in a way that preserves the appearance of the chart, and remediate from there.
"ISO 9000 deals with the fundamentals of quality management systems..."
Basically not something associated with "flavors" of PDF.
The Microsoft routine that exports a Word file to PDF does have an option to output ISO 19005-1 (PDF/A).
PDF/A is for archival PDF.
If the goal is to provide accessible PDF follow the advice of "C student".