Hi Peter Fabian,
If an interviewer looks at two resumes and two design portfolios, and he likes both portfolios in equal appraise, how will he decide which candidate to hire? He might notice that both people have about the same experience, a similar skill set and education. But if one candidate is an Adobe Certified Expert and the other is not, this can be the deciding reason in who gets hired.
Peter Fabian, there is not any eligibility criteria to appear for ACE certification.