Do I need a notarized translation of my criminal record certificate for a DTV visa application?

Sawadee, I help many people with DTV here. For criminal record certificate most Thai embassies accept English version directly. If your paper is in other language you need English translation, regular certified translation is usually enough.

Notary stamp or apostille is asked only by some consulates like in Europe or US when they are strict. So if your consulate list says notarized or legalized then you should add stamp. Better to upload both original and translation to avoid delay.

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Read the resident Embassy website.

Depends on the embassy you apply to, check their own checklist. Some want it apostilled and translated, many accept it as issued.

This just seems even more of a hassle to deal with

The Los Angeles consulate requires authentication by the State Department.

Just got approved from my home embassy, I uploaded everything in my native language without any translations

Depends on embassy. Prague needs legalized by MFA. Warsaw needs only notary translation

It really depends on each embassy. The Thai embassy in the Netherlands requires the certificate of criminal record clearance of the Netherlands to be legalized by the Ministry of Foreign Affairs of the Netherlands and by the Thai embassy itself before submitting.