Goals that I consider 100% of a world...I always aim for these. There's some missing obviously as the list of stuff to make is massive. Always try to make them look nice too
-farms for all monster types 100% automatic (spider, creeper, zombie, skeleton, pigman, blaze, enderman, witch)
-slime farm
-wood farm (using pistons where it puts all the logs in a nice box for you to chop)
-iron golem farm 100% automatic
-villager farm
-cooked chicken farm 100% automatic
-other animal farms (cow, pig, sheep, squid, etc)
-furnace auto smelt and disposit to chest 100% automatic
-find a mooshroom island and bring a mooshroom back to your base
-plant farm 100% automatic (reeds, cactus, netherwart, mushroom, pumpkin)
-automatic potion maker (press buttons on a wall and it makes potions for you)
-farm for all food types 100% automatic (carrot, potato, wheat, melon, cocoa bean, etc)
-at least one beacon with maximum pyramid size
-enderdragon egg obtained
-obsidian and cobblestone generator
-path leading to end portal from base via minecart
-jungle, water, desert temple fully explored
-one of all enchantment
-obtain one of every flower
-breed a mule
-fish and prismarine farm (water temples)
-autosorter for your crap
-a large map wall
-sand/gravel generator (bug, can skip this one)
-tame a cat and wolf
last but not least
-link anything far apart via nether