Depending on the context, you might want to make some distinction, since sometimes "validé" has a broader meaning - that the student has somehow acquired those credits and will never have to enroll in that module (or semester) again, for whatever reason. They might have already passed that particular course in another university (validation d'acquis), or they passed by way of attendance ("validé par assiduité"). "Admis" has the narrower sense that they passed in the "ordinary" way. I'd say "completed" does the job for a broader term like "validé".

If the context allows it/demands it, you might also consider using terms like "exempted", "transferred", "incorporated", or even "approved by [average, minimum grade, attendance, etc.]".

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Note added at 13 hrs (2022-04-28 10:12:41 GMT)
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I also found this:

Admis : matière que tu valides par la moyenne (donc 10 minimum) [note: not the same for every univesity]
Validé: matière que tu valides par compensation dans l'UE [unité d'enseignement] parce que tu n'as pas obtenu la moyenne

Meaning that some courses are considered "validé" when another course that goes with it has an average high enough to compensate the other one's.