I think everyone knows that in TUSM Peter revealed his identity to Hulk. But do you know that Thor also knows who he is?
In episode 15 of the first season, when Thor got to this alternate reality, where Doom took over the world, he meets Hawkeye (Bullseye), Sam (Snap) and Spider-Man (Slinger). While they were on the boat, talking about how they awaited Thor's appearance for years, Hawkeye introduced himself and others, revealing Slinger's real name and Peter himself showed his face.
Thor remembers everything that happened in this episode, including Peter's identity. Since "Avenging Spider-Man pt 1" (TUSM s3e1) aired later, Thor already knew who Spidey was by that time.