Very good guide by @megadeathstroyer
It should be noted you have to do these in a very specific order. Or at the very least it's possible you complete these in some other order and perhaps one or more do not award the green check mark due to game bugs. So I definitely recommend the order that guide presented as it's one that'll work.
Also make sure you don't get Johnny Mode before you've all the rest, as some become impossible to achieve once you're in Johnny Mode.
Very inspirational, despite it's age <3
Looking through the comments, nobody seems to have given up the ghost on where the eggs are lain, so, if anyone browsing these fine pieces of art in the future is really TRULY stuck...
From left to right top to bottom:
Gun in girl's holster - Winky emote by JackDCurleo
Green "Eye" shape on girl's hood - Tongue out emote by ZaneZansorrow
Center rubick's cube square (the one with the face on it) - Puzzled emote by Verspar
Scientist's test tube - Nerdy glasses emote by Lintire
Apple on fish hook - Eyebrow raised emote by Hoboweasel
Flame man's mouth - Annoyed emote by J-qb
This last one isn't needed to get the achievement, but it enables "Johnny Mode," delightfully enough! --
Man's face - Cheery/blushing emote by test-object (you have to click and hold this one, you'll notice the screen shaking as you do so~)
Big thanks for such a wonderful and inspirational game going out to all those artists who contributed to it all those years ago and the people who set it up~
AARGH, all but that weird, tiny, arc thingy easter egg! Anyone? Great art and a lot of thought put into it.
omg so hard! i only found 2 Easter eggs
I used to love bscon but now I love mac and cheese