'Outstanding publication commitments' meaning?
I believe "outstanding" here means "not yet completed".  However, I'm not sure whose commitment it's talking about, yours or the publisher's.  One interpretation is that it's asking whether you have committed to publishing anything that you haven't published yet (such as results from previous grants); another is that it's asking you to list papers that have been accepted for publication but are not yet in print.  I'd guess that it's the former, because it seems like a somewhat obscure way to ask for the latter, but I doubt anyone could say with any certainty without knowing more details.

Either way, this is probably not the right place to list your publications or related achievements such as conference organization or presentations.