And here they are, the buddy icon codes except for the [Top Secret] one, which can be found in this guide's 'Achievements' section.

frogfactions - this one flashes a symbol, then says invalid. This symbol can be found on another person's profie, this is more of an easter egg than anything else.

• rickandmorty
  
• herobrine OR minecraft OR notch
  
• nitw
  
• makesail
  
• overwatch
  
• hypnospace
  
• jacksepticeye OR septiceye
  
• markiplier
  
• kickstarter
  
• pewdiepie
  
• newgrounds
  
• va11halla
  
• kappa
  
• tacoma
  
• kindafunny
  
• grimecraft
  
• idubbbz OR idubbz
  
• fivenightsatfreddy OR freddyfazzbear OR fazbear
  
• undertale
  
• h3h3
  
• adventuretime OR finn
  
• doge
  
• nyancat
  
• firewatch
  
• inside
  
• littleredlie
  
• videogamedunkey
  
• chilledchaos
  
• squeezie
  
• aquateenhunger
  
• trogdor
  
• ssundee
  
• southpark OR ericcartman
  
• happytreefriends
  
• kreygasm
  
• ocellbito

Completing the story unlocks a secret buddy icon.

These are pretty self explanatory, but I will include them anyways!

• Summer '06 - Complete the Summer '06 chapter
  
• Autumn '06 - Complete the Autumn '06 chapter
  
• Winter '07 - Complete the Winter '07 chapter
  
• Spring '07 - Complete the Spring '07 chapter
  
• Summer '07 - Complete the Summer '07 chapter

These are unlocked by using the secret buddy icons, which can be found in the 'Buddy Icon Codes' section of this guide. When a secret icon is used, another friend window will be in your messenger. Click it and play out whatever is said to earn the achievement.

• Awe Jeez
  
• The World Needs Heroes
  
• Is Herobrine Real?
  
• Retro Computer Virus
  
• The A5G4RD
  
• HYPNOSPACE
  
• Raise Your Dongers
  
• Zenith Lunar Resort
  
• Classic Content
  
• Not Liable for Injury/Dismemberment
  
• My GOTY
  
• The Problems of the Future, Today!
  
• Make. Sail.
  
• Kinda an Achievement
  
• ...And Friends

Never Gonna Give You Up - Get Rick-Rolled... check out Mat's profile in the last chapter and get rick-rolled for the achievement.

During the course of the game, it is necessary to do the following to get this achievement:
- Tell Emily and Evelyn that you are a virgin, that you don't drink alcohol, and that you don't want to have a family after college. If you say opposing things to either character, you can't get the achievement.

These people gave a few tips, a little help here and there, etc. so I am going to give them credit here.

SodaCracker - Helped me by pointing out a critical spelling error!

Yarav - Helped with some Buddy Icon information.

Mistheil - Helped with some Achievement information.

sans - Helped with some Achievement information.

Metallicock - Provided alternate code spelling

RoboWaffle - Provided alternate code option

Yewkaliptus - Provided multiple alternate codes

SulferRingROKer - Provided alternate code spelling

I'd just like to take a moment to thank everyone for all of the support and positive feedback on my first guide! I never thought this guide would do as well as it did and I have the Steam Community to thank for that.

Thanks!