Coordinates of all the ionic steps are printed into the log file. However, the output is a text file, so, you can use a script to delete the blocks with unconverged geometries. Or, use a script to copy the blocks that says "stationary point found" to a new file.

If I understand correctly you need a PES section with all the converged points. GaussView can help obtaining the total electronic energies at each converged step and visualizing the PES diagram as a function of the internal coordinate(s) you are systematically varying.

Hi Przemysław,

Python is a good option to make scripts that retrieve information from Gaussian output files. As Uttam suggested, you can just grab the energies and coordinates of the converged geometries and make a xyz file with only the relevant information on it

So the answer to the question whether there is a KEYWORD for that will remain a mystery... I knew that it can be done with a script but it wasn't part of my original question.

To answer my own question - AFAIK there is no such keyword, but in GaussView 6 there is a option for it to read just converged structures, just go to "Open Files">"Options..." and check "Read Intermediate Geometries (Scans/IRCs)"