Before I start talking about the gameplay, here is my simple map of the game. It shows you all the main points of interest and I will refer to them several times:

• You will spawn in the kitchen storage, after that go to the kitchen
  
• Find Cooker Jr. in the kitchen to bake cakes using ingredients.
  
• Blue marks on my map show possible ingredient spawns; there are always 6 different ingredients to bake different cakes.

• Collect ingredients and bring them to Cooker Jr. before the first boss, Cakey, spawns after some time
  
• When near Cakey, his life bar and a cake symbol appear in the top right corner, matching Cooker Jr.'s cake symbols.
  
• Bake the cake with the correct symbol and throw it at Cakey to drain his HP.

• You can hide under tables & in boxes
  
• Each time Cakey goes through the purple doors on the map, the cake symbol and the needed cake reset.
  
• Defeat Cakey to get a key to open the door in the Freezer room.

• Before entering the oven room, gather enough ingredients to save time when the second boss appears.
  
• The second boss, Frostina, spawns when you enter the oven room.
  
• Repeat the process of baking cakes and throwing them at the boss.
  
• Frostina drops the second key, which opens the door in the storage room.

• Enter the processing hall to spawn the final boss, Candy Bane.
  
• Kill Candy Bane with cakes to get the key for the exit area door.
  
• Open the door, choose a box, and make one last run from the baker

Earn the following achievements by simply completing the game.
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Factory Tour
Unlock Processing


Defeat the first boss (cakey) and open the door in the freezer room.
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Hot and Cold
Unlock Shipping


Defeat the second boss (frostina) and open the door in the storage room.
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Go To The Light
Unlock the Exit


Defeat the third boss (candy bane) and open the door in the exit area.

To get this achievement you have to find all of the chilrdren´s notes. I marked them all on my map, but i will also share some screenshots here (click on the pictures to enlarge them:
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Crate Expectations
Read All of the Children's Notes


Kitchen Storage (Note 1)
Cookie Bar (Note 2)
Cakey´s Bakery Hallway (Note 3)
Shipping (Note 4)
Shipping (Note 5)
Processing
Processing Back Room


These two items are not only collectibles but also help increase your ingredient carrying capacity. They are also marked on the map.
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Sugar Rush
Acquire the Basket


The basket can be found in the Shipping room, after you defeated the first boss (cakey) and opened the door in the freezer room.
My screenshot was taken after i already clicked on it, but it will appear next to the cake.
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Super Stylish!
Acquire the Backpack


The backpack can be found in the processing back room, after you defeated the second boss (frostina) and opened the door in the storage room. The backpack will be on a shelve in a corner of the room, my screenshot doesnt really help out but here you go:

The following achievements are ending achievements, earned by completing the game in a specific way.
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Good Sister
Save George


In the exit room, after you opened the exit door, you will see 8 different boxes, pick the right one, by reading the notes carefully, there will be hints about the right box. Now finish the game by running out of the Bakery.
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Explain That To Mom
Leave George Behind


In the exit room, after you opened the exit door, you will see 8 different boxes, pick one and hope that George is not in there. Now finish the game by running out of the Bakery.

Little Helper
Save Sweetie


There is a cupcake named Sweety with various spawn locations, which are not marked on my map. Sweety is usually found on shelves. You have to find Sweetie, the cupcake, and put it in a green bin with a cupcake icon on it (the green bin also spawns in different places every game)

Earn these achievements by bringing a certain number of specific ingredients to Cooker Jr.

This becomes easier with the basket and backpack (marked on the map), as they increase your carrying capacity.
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Sweet Cubes
Collect 100 Aged Sugar


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Grave Robber
Collect 100 Flesh Cubes


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Chocolate Hoarder
Collect 100 Canned Cocoa


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Dairy World
Collect 100 Whole Milk


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Dead Head
Collect 100 Brittle Bone


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Peanut Butter Nut
Collect 100 Peanut Butter

Earn these achievements by baking a specific number of a specifc cakes with Cooker Jr.
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Baking Bad
Bake 50 Sweet Runaway Pies


















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Death By Chocolate
Bake 50 Chunky Chocolate Pies






















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Maximum Funkage
Bake 50 Funky Funeral Pies





















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You Nutty Baker
Bake 50 Poltergeist Peanut Pies

The following achievements are pretty much self explanatory. Select the game mode in the main menu and do what the achievement says.
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Cooker Sr.
Complete Hardcore Mode


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Master Chef
Score 10,000 in Endless Mode

Thank you for reading this guide! If you have questions ask them in the comments below!
Have a nice day!