I found some information from a user who has faced Due Diligence Processes and shared some requirements that auditors usually ask for: 1. Hiring 2. Employee Handbook (Policies & Processes) - This may include Fair Employment Practices, Anti-Bribery Policy, Whistle Blower Policy, and PoSH Policy. For annual performance appraisal, you can look into your internal processes to figure out what you need to put in the handbook for ready reference. Regarding soft skills, leadership traits, and other attributes, you can create a resource center with ideas about articles, topics, books, and courses that employees can take. Unfortunately, I couldn't find a complete HR audit guide or checklist from the given sources.