给你的战斗机加奶酪（Cheese your fighter.）

「Strategy」

From the start of the game go down the monarchy path. Delete your starting army and airplanes. Somewhere before taking the focus 挪威王国 go down Start Rearmament, Kickstart Military Industry和Expand Hæren. This so you get an starting industry and some extra manpower. 1 factory each, for now, for: Infantry Equipment, Support Equipment, Artillery, Anti-Air, Trucks and Trains. Adding more factories along the way (for example after Shield of the North. Furthermore, there are several things to keep in mind:

• You need over 55% war support to unlock Shield of the North focus. When you're working on the monarchist demonstration decisions, keep in mind that you should utilize the political power to gain more war support ( The negative construction/civ factory state modifier reduction/removal decision remains available after taking the focus 挪威王国). So you should wait with taking that decision until your war support is at least 55%.
• You need to take the demonstration decision 12 times to be able to complete the focus 挪威王国. Doing more has no added value, unless you want some cheap militia. But in that case I would advise taking 4 of the demonstration decisions 3 times.
• Besides the the three military/industry focuses mentioned in the first paragraph every focus until deep in to 1939 will be in the monarchy path.
• Don't spend any PP on advisors until you are done with the monarchy decisions for war support and removing the construction/civ factory modifier. The only exception is raising your economy law to Partial Mobilisation.
• Create an Spy Agency in time. Cancel trade temporarily for enough civilian factories if needed.

Once you've completed 挪威王国 go down the following path: Appoint Prince Olav to Army Staff -> Power to the Royal Guard -> Encourage Recruitment -> For the King and Prince -> Shield of the North ->Our Royal Claims. While doing these focuses start building an army (depending on your template and whether you took some of the militias), your army shall be anywhere between 8 and 20 divisions). Whether you receive the claims in the focuses that follow partly depends on RNG. I do believe sending Trotsky back to Soviet Union after imprisoning him does increase your chance a bit with them. But those states are not a deal breaker.

First go for your claims on  丹麦. Best case they say NO, you conquer them in a simple war and can bypass the other  丹麦 claim focuses. If  丹麦 accepts go for the Claims on Faroe Islands -> Bjarmeland-> Consolidate the Kingdom. If you had good luck it should be early 1939, bad luck and you're already in may 1939. With the extra manpower increase your army to around 20 - 24 decisions. Put a spy in  德国 to pressure the government. This together with improving relations should be enough for a non-aggression pact.

If  丹麦 no longer exists go for your claim on  瑞典. Otherwise fist claim the remainder of  丹麦 ( 格陵兰) and then go for your claim on  瑞典. Normally  瑞典 says no (if you're unlucky  瑞典 says yes and you'll have to wait utill 50% world tension to justify) and you should be easily able to conquer them. 2 divisions in Copenhagen, 2 division on a fallback line from Trondheim directly to the Swedish Border. The remainder of your army on the border with  瑞典 to the south of Trondheim. The AI will largely focus on taking your northern states, so you should be able to relatively freely walk into  瑞典. Once the south is conquered simply push north and they should capitulate quickly. Now you can restore the Kalmar Union.

Train a couple more divisions and justify on the  英国. At this point they are likely already at war with the Axis and therefore the justification should only take 30 days. Once declared it's up to you whether you join the Axis or only ask for military access. If you choose the latter keep an eye on when the non-aggression pact ends and renew it immediately. Otherwise the German AI declares war on you within 72 hours after it ends.

The navies of  丹麦,  挪威和 瑞典 together should be enough to get naval dominance. Once the  英国 capitulates focus on getting  England in the peace deal that follows and the remainder of your points on the navy. Now you can restore the North Sea Empire.

Now you have enough manpower and factories to build a powerful enough army to defeat the Axis. Depending on your skill level it might be smart to first secure your southern flank by conquering/puppeting  维希法国和 西班牙 (and if you aren't in a hurry  葡萄牙 as well). Your best chance to attack the Axis successfully is when they are busy in the  苏联. However, do remember that since the Allies are gone this Axis is more powerful.

Defeating the Axis after the fall of the Soviets is still possible, but a lot harder. Unless you're lucky that  土耳其 takes the focus that allows them to form a faction with  意大利 and with that reducing the amount of fronts you'll have to fight on with the Axis. The Turkish/Italian faction is easy to defeat, so don't worry if it forms.

Finally, what ever you do, keep historical AI Focuses on. The RNG you're going to need otherwise to get this achievement becomes far to big ( 瑞典 can attack you when you're not ready or joins the Allies / Democratic Germany forms a mega faction, etc). Unless you get a very lucky roll. But don't count on it.

Update. In new version you cannot restore Kalmar Union and then restore North Sea Empire. You have to choose only one from 3 unions.

The Easy Strategy, which Prepares You for a World Conquest

What you want to do is to rush down to flip monarchist and immediately rush down to Shield of the North through Appoint Prince Olav to Army Staff -> Encourage Recruitment -> For the King and Prince. Make sure that you increase war support through the "Promote the Armed Defense of Norway" until you hit 55% war support. Make sure to also remove "The Hard Thirties" national spirit through clicking "Prop Up the Economy" three times. You must do this before you become monarchist through 挪威王国 as these decisions will no longer be available. Do the monarchist demonstration 12 times as they reduce your stability and war support and to be honest, the militia units they give are NOT helpful (see below for explanation).

Once you become monarchist, you will get an event called "The Regent's Intentions," where you can choose to: (1) Place the regent as your king, (2) Build good relations with the Nordic neighbors, or (3) Work to rebuild a North Sea Empire. Do the 3rd option as it gives -100 opinion with all of the Nordic countries (you want them to refuse your demands so you can take them over) and gives a national spirit, where at the cost of -10% political power and -10% stability, decreases war justification time and reduces the generate wargoal tension limit by 30%. This reduction of wargoal tension limit is very important. Work towards Shield of the North, and as soon as 20% world tension has been reached (through Anschluss, most likely), justify on the Dutch East Indies (yes, this is why you take that National Spirit!). Keep only 10 of the divisions and bank 300 political power so you can do extensive conscription and war economy as soon as the war starts. Take over the Netherlands (including their oversea territories) and puppet the Dutch East Indies.

Now, with the Netherlands defeated, you should be doing Claims on Denmark和Claims on Sweden directly. There's no need to demand Greenland, Iceland, etc.. You want Denmark and Sweden to refuse you. Train 10 9/1 infantry divisions but do not deploy them. Delete your current army. Most likely Denmark will refuse you (you want to make a save before you start to demand Denmark and just take another focus. The RNG can be annoying but taking another focus uses a different RNG compared to the one that is used that time). When Denmark refuses you, declare war immediately (to prevent guarantees) and immediately declare war on Iceland before unpausing to prevent them becoming independent. Deploy the 10 infantry that has been queued up and crush Denmark through naval invasions (force attack might be necessary to cross the straits). Annex them with their navy. Also, crush Iceland by naval invading them from Faroe Islands. You can start to demand Sweden when Denmark refuses to give you the land, but if Sweden says yes, you can simply take another focus in the meantime and do Demand Sweden later, etc..

After you crush Denmark and Iceland, you want to disband your whole army and queue up 8 "Dragonregiment" (6 width calvary divisions). When Sweden says no, deploy them and train another 16 calvary division and as many 9/1s as you can. Crush Sweden through maneuvre warfare (walk through the gaps of their lines, destroy their divisions, rush VPs, etc.). Note: The 8 calvary divisions should hold the line from Oslo to Trondheim and you can just let Sweden walk into Northern Norway. Then reinforce them with the strategy above and VP rush Sweden.

Now you can reform the Kalmar Union. Wait until WW2 (get a Non-aggression pact with the Axis) and justify on France. When Germany declares war on the Benelux (the Netherlands should have been annexed so you don't have to worry about Germany coming for you here), you can simply blast through Belgium and into France. You might need to join the Axis to have proper supply. Naval invade the United Kingdom and bag them up in London and take the rest of the isle. If possible, launch a naval invasion into the Isle of Man so you can reform the North Sea Empire right before the Peace Deal to take the English lands for a very cheap price. In the peace deal, focus on Canada (to attack USA), Guyanas (for Aluminium), Metropolitan France and Corsica and all of the British cores (for industry), Malaysia and Ceylon (for rubber and resources and to deny Germany of them), and whatever else you can get. You should be able to get them.

Afterwards, prepare collaboration governments on USA and crush them. Also crush Japan. Now it's time to fight the Axis (most ideally, the Axis should be stuck deep into the USSR way past Leningrad, Moscow, and Stalingrad and all they are doing is having a stalemate). Leave the Axis and justify on them. Make sure you outnumber them in Fighters and CAS (build meta CAS and meta fighters. Yes, they are expensive, but they are very powerful and can easily shred the Axis airforce) --- it's recommended that you put 75 factories on fighters and 75 on CAS (you also need fighters and CAS to crush the USA, by the way. And if you wish, you can do "Norway Jose" achievement after defeating the USA by pummeling Mexico). Just slowly wear down the German airforce, and after that's down, you can use your ridiculous amounts of fighters and CAS to punch through the German line (as without Germany, the Axis is basically useless) with space marines (yes, invest in them!). You can naval invade Italy with the fleets you get from USA, France, UK, etc.. After crushing the Axis, you should have an Italian puppet which you can annex for the achievement if needed. If Soviets control Italy (which has happened several times in my runs), simply attack them RIGHT AFTER THE AXIS WAR as they are pushed back too deep that they don't have many divisions and you can simply walk into them to cap them. A naval invasion into Vladivostok and a single collaboration government might be necessary, but at that time, you should have gotten the achievement and become so strong that nobody can stop you, and you can continue this into a world conquest easily as all of the major countries that are actually decent in strength (USA, Japan, Germany, Italy, France, UK, USSR) as all been crushed.