Aztec AdVenture! is one of the events in AdVenture Ages and is the third event ever released, and was rebalanced and extended in May 2022. This event cannot be completed without buying at least three bundles, probably four. Level 6 rares are needed to feasibly complete this event, and obtaining that cannot be done as a F2P Player.
In the early and middle ranks, production is easy and you'll be waiting on population. This is because individual production rares have been added, and production missions were not properly adjusted to account for those until later on. In the last few ranks, both production and population missions are extremely difficult.