Besides my goal of obtaining the Grand Armada achievement, I also got the City of Cities and Voting Streaks achievement too.
Honestly, who need 500 heavy ships? 200 three-deckers or 100 three deckers with some trade ships should be enough to win any sea battles against AI. First, building 500 heavy ships costs 500 X 50 =25,000 ducats. If player has the fourth idea in the Maritime idea group, player should save 5 ducats in every heavy ship. Also, some nations like Scotland, Majapahit, Sunda… has this 5 ducat off discounts too in their national idea.
Maintenance could be varied due to mothball/active status and period of time. But every EU4 player can imagine how expansive it could be to have all heavy ships active in the same time. For me, I started building ship in the beginning of the game and rushed to complete the “project” in the late game because I wanted Maritime to be my last idea group and wanted to save more money first.
So yes, more than half of your heavy ships will be mothballed if you want this achievement.
City of Cities
First, all East Asian AI should thank me for raising my development. They won’t be green in the tech map without me. For Malaya, all of the provinces are tropical, the best terrain would be grassland+trade port (Pasai). About 50 years before reaching the global trade institution, I moved my capital to Pasai to “develop” printing press. And that’s all, I didn’t raised its development until the universities are build and having 60% administrative efficiency.
It would be easier if I play Ming and raise development in Beijing. Beijing is already the capital of Ming, started with 33 development, farmland+trade port bonus. In addition, if the economy idea group is taken, it will cost less too! Doing it in Beijing would definitely save much more monarch points than a tropical port.
Last but now least, voting streak. All is needed is to switch to constitutional monarchy and give 100% in every debate. 100% are always immediate pass. It can save a lot of time on “debating”