The player's country:
- is Corfu.
Core-fu is an achievement that requires the player to revoke five or more cores in a single peace deal as Corfu. Corfu doesn't exist in 1444, but it can be released from its core province Corfu which is owned by Venice, thus it's highly recommended to start as Venice in 1444 for a quick achievement run.
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The achievement can be completed in just a few wars, without having to fight a single battle. Because you want to revoke Venice's cores during your war for independence, some preparations are needed.
First two wars
Venice starts with a non-owned core on Lezhë but may transfer it to Corfu when released so you need to abandon 5 non-Venetian culture provinces beforehand. First, fabricate a claim on Croatia and declare a conquest war as soon as possible. You want Hungary to occupy and transfer the occupation of the 3 provinces bordering Croatia. In the peace deal, offer those provinces and whatever is needed to reach the war score but do not return Milan's cores. Then, declare a no-CB war on Milan's ally (or Milan itself if you wait for the truce to expire) and again, wait for your enemy to occupy and transfer the occupation of the 2 provinces Milan has a core on. In the peace deal, offer those provinces and whatever is needed to reach the war score. Be careful to use the Cede Province tab in the peace deal, as Return Core will also destroy Venice's core. You can mothball forts in those provinces to make the wars faster.
To make your war against Venice a little easier, you can choose to cripple its economy: delete your army and navy, take loans, spend money on advisers and use your monarch points to develop in Corfu. You may also debase currency or destroy all your forts to make sure Venice won't fight back later. Then, release Corfu and select Play As.
Last war for independence
The truce will last for 5 years. During this time, try to hire a diplo rep adviser, build an army up to force limit, 1 or 2 boats, and improve relations with any country which is a rival or hostile towards Venice. Most likely, countries in Balkans ( Serbia, Bosnia, Ottomans) or Italy ( Genoa, Savoy, Naples). When you are strong enough to take on Venice with your allies, declare war, sit back and let them fight for you. In the peace deal, your goal is to revoke Venice's cores on the 5 provinces you gave to Milan and Croatia.