In addition to the general Traits PDF, you can usually download the various Players Guides for free as well, to skim over their traits.
Legacy of Fire PG
Regional (Katapesh) Traits; Desert Child, Duskwalker Agent, Freed Slave, Merchant's Child, Nightstall Urchin, Pesh Addict, Pesh Dealer, Savannah Child and Uwaga Highlander.
Race Traits; Animal Friend (gnome), Child of Zolurket (dwarf), Ekujae Reflexes (half-elf), Forlorn (elf), Freedom Fighter (halfling), Genie Blood (human - Keleshite), Historian (human - Garundi), Latent Psion (human - Vudrani), Legacy of Sand (half-orc), Spirits in the Stone (human - Mwangi) and World Traveler (human - Varisian)
Religion Traits; Blade of Mercy (Sarenrae), The City Protects (Abadar), Cleansing the Twisted (Sarenrae), Eyes and Ears of the City (Abadar), Magic is Life (Nethys), Strength of the Sun (Sarenrae) and Wisdom in the Flesh (Irori)
Campaign Traits; Earning Your Freedom, Seeking Adventure, Reclaiming your Roots, Gnoll Killer, Missionary and Finding Haleen.
Council of Thieves PG
Campaign Traits; Child of Infamy, Conspiracy Hunter, Diabolist Raised, Infernal Bastard, Shadow Child, The Pathfinder's Exile and Westcrown Firebrand.
Curse of the Crimson Throne PG
predates Traits being divided up into Regional, Racial, Campaign, etc. but all could be considered Campaign Traits; Drug Addict (Addicted Friend or Personal Addiction), Framed (Family Honor or Dropout), Love Lost (Orphaned or Widowed), Missing Child (Missing Sibling or Missing Son / Daughter) and Unhappy Childhood (Tortured or Religious).
So, about 50 Traits available for free, in addition to the 40 Traits in the basic Traits PDF, which is also a free download.
Other Traits can be found in products you have to buy, such as Elves of Golarion, Qadira, Gateway to the East and Cheliax, Empire of Devils. (The Osirion companion does not have any new Traits in it, but you can find some Osirion-flavored fan-made Traits in the Wayfinder, also a free download at the Paizo site.)