This is a guide explaining how to get the missable achievements and the 10 pizzas in chronological order. If at any point, you went too far and missed something, you can go back to the main menu to start the campaign again from the first person game or in ... 

hello, in this tutorial you will learn how to play duck simulator 2 

Step 1: Open the game Step 2: Press the "Switch Game" button Step 3: Hit play Step 4: Increase volume Step 5: click on duck Repeat Step 5 until your head hurts Headphones recommended for maximum efficiency 

self explanatory 

This tells you how to get the final ending in duck simulator 2. (involving the locked door)