You're asking for a list that isn't really available and might never be complete even if it is. For what it's worth, I'm not aware of any other openings that have had their titles FIDE approved.
In general, FIDE does not deal with the names of openings - to give one simple example there is still ambiguity about whether to call 1.e4 e5 2.Nf3 Nc6 3.Bb5
the Spanish Opening
or the Ruy Lopez
. These things are normally more a matter of convention and influenced almost entirely by the use of names in the written works about them. As a result, I believe that the approval of the name 'Latvian Gambit' was more a special recognition than a matter of actually attempting to codify opening names on any significant scale.