Use VGM Toolbox from the wonderful team over at HCS.Download VGM Toolbox here
Extract the archive and navigate the following
VGMToolbox > Misc. Tools > Extraction Tools > Common Archives > CRI ACB/AWB Archive Extractor
Tick the box "Prefix file name with Cue ID (.acb only)
So the filenames are stored in the .acb file with the same filename.
BGM.awb <-- Audio wave bank
BGM.acb <-- Audio cues (filenames) along with other useful information.
Without the .acb you cannot get cue names from a .awb file as you've seen.
If that doesn't work either, you can get a copy of the CRI Atom Craft middleware and use that to open up the .awb and .acb file and playback each file and rename them one by one.