I’ve been spammed with that Earthen system message at least twice per session upon interacting with an NPC (usually it’s the flight master). I can’t recall exactly when it started, but it’s definitely been a thing since at least the earthen race became unlocked.
For myself, the achievement spam did not occur at the same time the “You are now friendly with the Earthen” reared its irritating head. It came weeks later on October 1st (a maintenance day) and I was less than thrilled to have the original dates wiped out.