Board Thread:Questions and Answers/@comment-75.170.147.95-20190914212740/@comment-27713488-20190925070100

Then my only advice is to try all the buttons in the Keyboard tab of the F1 menu that are designated to do various things, and see which ones bring up the quest log. Oh and make sure you aren't already in some sort of menu or event when you try.

Does PageUp work at least? I don't think that one is remappable.