I've noticed that when using the te4.org site to push achievements, some of the event ones ("Got eggs?", "Don't Poosh it!" and "Can you bear it? So much bearness!") don't always push correctly. I have the "Got eggs?" achievement in Madness (Roguelike), but it will not give me the lower difficulty versions, while both "Don't Poosh it!" and "Can you bear it?..." only pushed correctly when I earned them on Insane (Roguelike), so I had to do Madness (Adventure) and (Roguelike) as well to earn the complete set for each achievement.
As such, I assume the same would be necessary for "Got eggs?", but I can't test that until near Easter, which is several months away. Every other achievement seems to work fine, even other event achievements like "Catch that Plumpkin!" or "Ay ay captain!" pushed perfectly fine with only Madness (Roguelike) having been earned, so I'm at a loss to explain why these specific achievements seem to operate differently.
Also, the "I meant to do that... (Roguelike)" achievement completion icon seems to be broken on Steam. All the others are perfectly fine.
EDIT: Literally a minute after I initially posted this, I checked the te4 website and noticed that it says I have all of the "Got eggs?" achievements, while Steam reports I only have the Madness (Roguelike) version.
Certain Achievements Not Pushing Correctly
Moderator: Moderator
Re: Certain Achievements Not Pushing Correctly
Humm can you check if this only happens to you for achievements linked to pushed/seasonal events ?
[tome] joylove: You can't just release an expansion like one would release a Kraken XD
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning

Re: Certain Achievements Not Pushing Correctly
I can confirm this only happens for seasonal/online event achievements like Poosh, Bearscape, Pirates and Badassry.
posetcay, the guy who only plays Doombringer