Hi Karen,
You could go to http://www.abs.gov.au to check for the duties against each ANZCO code. If you find a code matching against your duties you can submit for assessment. However, you should also check if this code is in the SOL / CSOL in DIAC website . If its listed you are good to go with ACS assessment. My degree too is non-ICT one, but it had subjects on IT and closely related to IT. So, I got that assessed by submitting the syllabus detailing number of hours spent on IT subjects. Reference letters or Statutory declration are required for ACS to prove your experience. Payslips are/may be required for DIAC assessment.
Do you have any vendor certifications ?