Leads can be found almost anywhere, from nearly any activity like opening a chest, defeating a boss or even purchased from a general merchant. I’ve created a catalogue to help you see the final rewards and be able to organize the information as you see fit.
There are 250+ leads that require you to travel throughout Tamriel to complete.
For beginner antiquarians, I highly advise you to start with green quality leads, which represents the lowest difficulty level, and work your way up.
You can find more information about Antiquities here.
Credit goes out the community of adventurers for finding this information and a list created by Inklings