Herbology is the 33-entry set of berries, herbs and mushrooms you gather in the wild. Each region has its own plants, and every type you pick for the first time is logged with a photo in your journal.
Check the map's regional counts to see what is still missing. If you need a mushroom, skip Belknap.
Collectibles
Days Gone has nine collectible sets, from character keepsakes and roadside plaques to NERO files, Ripper sermons and wild plants. They are spread over all six regions and are logged in the Secrets tab of your journal.
Tourism
Tourism collectibles are 28 pre-outbreak brochures, menus, posters, signs and postcards. Most sit inside diners, motels, gas stations and visitor centers, so search buildings as you pass.