the biggest burden a Collector faces is completing the Metals, Fossils, Crystals, and MySims Trophies collections. While other types of Collections are completed at home or via Fishing, travel, etc. General Collecting Tips for Rocks and Plants Game Pack Additions - Outdoor Retreat adds Insects to the game.
Not Every Collection has a link - this is because the page doesn't exist yet! This section is being prioritized until these are all finished.
As Expansions and Game Packs add more types to Collect, I'll gradually expand this list so that it always remains helpful for players who want to find everything. Here you will find the basic information on how to collect each of these, how many there are and where/how rares are found, and a link to in-depth information on prices for every type of collectible. Each of them are found in different ways, so each deserves its own Guide with lists to help you figure out what's missing. The Sims 4 Base Game features 13 types of Collectibles that can be gathered by Sims. The Sims 4 Collecting Guide Collectible Lists and How to Find Rare Types Metals, Crystals, Trophies, and Fossil Collections are found by Digging