When going into my world that uses the custom datapack that I'm working on, the functions work properly but the achievements do not.

"gamechanger:root" doesn't load, and thus isn't triggered by either picking up 1 cobblestone or by /achievements grant  (player) only gamechanger:root

And because it's a root file, its child achievement won't load either.

I am unfamiliar with JSON, so it is very possible that I made some mistakes, but I do believe I've checked everything within the files, and even compared everything to all of the tutorials I've been following, as well as the Minecraft Wiki. And despite everything seeming to look okay, it's still not working.

Attached is a screenshot of the in-game messages and command interface, a screenshot of the game output during the time of the first screenshot, and the datapack itself.