Hello @Cezar_Ayran,
are you aware of the Proofing feature that Asana offers: Proofing in Asana | Product Guide • Asana Product Guide
And you can also work with rules (that trigger based on a custom field drop-down selection or task moved to a new section, etc)
This might be helpful as well: Approval Workflow - #2 by Andrea_Mayer and Use Asana’s new Approvals feature to track task progress
Does that help?