To get everything unlocked immediately, one must first get to the save-file, whose location will vary depending on your operating system. See here:

Windows: C:/Users/[USERNAME]/AppData/LocalLow/noio/Kingdom
Mac OX X: /Users/[USERNAME]/Libary/Application Support/noio/Kingdom
Linux: /home/[USERNAME]/.config/unity3d/noio/Kingdom
Android [courtesy of Fulano, I didn't know they even had this]: /Phone/Android/data/nl.noio.kingdom/files

Inside each folder, there will be an extensionless file named "unlocks". I highly recommend copying it and making a backup in case you break your unlock config.
Now, open this file with a text editor. Notepad will do. The inside of the file should look like this:

{"unlocked":[0,4,10,5],"recentUnlock":5,"forceRecentUnlock":3,"land":4,"gameFinished":false}

The above is my own save file. Now then, here comes the important part: there are 13 unlocks in the game, so to unlock everything you will add all the numbers missing from 0 to 13 into the "unlocked" brackets like so:

{"unlocked":[0,1,2,3,4,5,6,7,8,9,10,11,12],"recentUnlock":10,"forceRecentUnlock":2,"land":4,"gameFinished":true}

The above is my current save-file. Note that it is not necessary to change following variables: "gameFinished", "land", "forceRecentUnlock", or "recentUnlock". They matter very little, if at all, and all that comes to the point is that which is between the brackets of "unlocked".

Here are the IDs of the proper unlocks, courtesy of Pangolin:
0 = Statue: Archer
1 = Statue: Builder
2 = Statue: Scythe (farmer)
3 = Statue: Knight
4 = Superior Horses
5 = Warhorse mount
6 = Bear mount
7 = Stag mount
8 = Unicorn mount
9 = Dog
10 = Hermit: Ballista
11 = Hermit: Bakery
12 = Hermit: Knights

Have fun, if possible! Har har!