How to add custom criteria for a user to move from TL0 to TL1?

We want to move the user from TL0 from TL1 based on the number of posts which got approved given that TL0 user posts will be reviewed.

Have you tried going through the Trust Level section ( /admin/site_settings/category/trust ) of your admin settings to see if the available options are helpful?

Yes, I did. I could not find the setting which we need.