Fairly sure that the Tuesday achievement (in its "unofficial" way) only works via the BIOS, changing date/time in the "easy" way apparently doesn't work. I haven't tried it myself, but it would explain the low percentage in the global achievements.
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Yeap doesn't work with clock settings. Don't know about BIOS though.
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The Unachievable achievement was actually achievable though it had random requirements which the dev changed every patch.
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As HoLYAssAsIN said it was (is?) technically achievable, but he tied it to some random actions and whenever someone found out what those were he would change the requirements. So technically it's possible to "legit" complete it 100%, but you'd have to be extremely lucky to stumble upon those random actions by yourself. Not sure if it's still possible know, since I assume he got tired of changing the requirements and probably just disabled it or just made them so obscure no one has found them since.
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Don't forget another achievement: "Unachievable -- It is impossible to get this achievement." ;-)
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Sorry to break this to you, but this achievement's description is a lie ;)
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Forgot about that achievement. Just checked, and it seems I have another year to go. Thanks for the reminder!
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LOL, these achievements are a good reason to add this game to my wishlist now XD
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