Building on Heather's post, I agree that the 'Logros del expediente' is something like the achievements on record (presumably for the student in question).

I think there's one key issue that's complicating this term - namely that Convocatoria and Logro Academico are separate ideas. To verify this, Google "Convocatoria Logro Académico" and take a look at the PDF results that come up. I won't post them here, because a) they're presumably personal documents and b) I don't know how to post image snippets.

The point is, you'll see something like this:

Logros del Alumno/a
Convocatoria Logro Académico
J 2014-2015 Graduado/a en Historia

"Convocatoria" literally means "convocation", as Heather points out, but in Spain these are twice-yearly examinations that students sit to graduate from various academic programs (see below for some ProZ glossary entries to this effect). So in the example above, J 2014-2015 means the June examination session for the 2014-2015 academic year. Following this, we can see that the "Logro Académico" is the academic achievement, in this case a diploma in history.

Here are the entries on 'Convocatoria':
https://www.proz.com/kudoz/spanish-to-english/education-peda...

https://www.proz.com/kudoz/spanish-to-english/certificates-d...

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Note added at 5 hrs (2020-01-03 21:12:30 GMT)
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No worries! It took me at least 5 or 6 read-throughs to figure out that they were different things myself. Looking through the PDFs I can find online, the formatting is universally bad, not even a tab separating each item in the table. Good luck with the rest of the translation!