The 'Hour of the Alpacas' is a date/time-based achievement.
The idea being that every once in a while, Age of Mythology: Extended Edition's developers (Skybox Labs) will launch the 'Hour of the Alpacas' event. If you start a match during one of these events, the achievement will pop.
I personally dislike achievements like this - it's not a showcase of skill, or a prompt to complete a challenge a certain way, you just have to be lucky enough to be playing the game when the developers decide to activate the event. Which, ok fine... but the developers haven't launched an Alpacas event in about 5 years. As a bit of a closet completionist, stalking AOM and Skybox's Twitter accounts hoping for an event is wearing a bit thin.
Is there some other way to trigger this (mostly) pointless achievement?