A year ago, after getting back on the horse and getting the Steam 100% achievement that missing the one set of Kogawa’s balloons faulted my first playthrough in the third week of release, I started seriously tracking sets of items and slowly adding bits to this place to store it all. One thing was the “checklist” blogs that I ported to checklist articles. You could click through items to mark them off as long as the session was not refreshed.
I started a new project back in March. I now have an almost complete list of the game items that can be counted and stored locally, the HL Tracker.
It’s not great on a phone, but I’m working on it. It will track experience points and levels as well as Challenge completion. See also: