I've had this idea for a mod that sorts and separates achievements icons, but not only do I have a very hard time understanding java, I also have no idea how to access the stats page, edit existing text/icons positioning and finally do all that in a mod.

Despite no lack of trying to find documentation on mod-making on the internet, the couple guides I could find are very lackluster and none has any information for what I'm looking to do ... Closest thing I could find is the CCSE documentation page[klattmose.github.io] with the Game.customStatsMenu hook, but I have zero clue on how to use it to my end.

Once I know how to edit the achievement page, I assume all I have to put in there is HTML text, which shouldn't be too hard to wrap my head around, right ? ... Right ?