ISO 9001 processes and procedures in certification

First, process and procedure are two different things. A process is a set of activities that convert inputs into outputs. A process is represented by a verb because process is transformation, process is action. A procedure is a description of what to do or how to do it.
You do not need a procedure to describe every process or every job your organization does.

ISO 9001:2015 has no mandatory procedures. Please check this article - List of mandatory documents required by ISO 9001:2015 - https://advisera.com/9001academy/knowledgebase/list-of-mandatory-documents-required-by-iso-90012015/ 
Please also take a look at clause 4.4.2 – It is up to each organization to decide which procedures are useful and should be developed. More complex organizations, or organizations with less training, or organizations with more staff turnover, normally decide to develop more procedures.

You can find more information below:

• ISO 9001:2015 process vs. procedure – Some practical examples - https://advisera.com/9001academy/blog/2016/01/19/iso-90012015-process-vs-procedure-some-practical-examples/
• Free online training ISO 9001:2015 Foundations Course – https://advisera.com/training/iso-9001-foundations-course/
• Book - Discover ISO 9001:2015 Through Practical Examples - https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/