Collect all the things! Vanilla Minecraft 1.13 scavenger hunt. Collect all items obtainable in survival.
Wholly inspired by lorgon111's "Quest for every item!" Exploration and Tactics series (https://www.youtube.com/watch?v=X85Lc7-aBXY&list=PLHYAYMSbpcvsqOj88Bu_O0eVjVEH-7Y2F), I've created a similar minigame for Minecraft 1.13.
To get started, load into a new world, and start collecting items. As you collect new items, you'll see messages like: "All the things: You just discovered Oak Planks!"
To display your progress in a bossbar, just drop a written book. You will then receive a special book that lists all the items in the quest, and displays your progress visually as a bossbar.
The command functions were mostly auto-generated by another program I wrote, to avoid copypasta errors (and because I'm aggressively lazy like that). I have the test for new items only running once per second to help avoid lag. I can't figure out how to use a scoreboard value to toggle between different texts, so right now if you have already collected an item, you'll see the number "2" beside it in the quest book.
Enjoy! mcskware 2018-02-04