Portugal.

While you aren't strictly required to be certified to work as Engineer. You are required as such by law in case you have legal responsibilities on the project, like having your name in contracts.

Additionally any university that wants to offer an engineering degree, must have the degree certified as compliant with the Order requirements for such a degree.

So even if you don't do the certification, at least there is some assurance regarding the quality of the teaching.

Some other European countries have similar approaches to this.