It took a while but I finally got all achievements!
I'm officially a overachiever :-) yay!

Congratulations! (Achievements not uploaded online yet)

Time to work on getting -17 in syllogism :)

Well done mikka! :)

Which one (I know, overachever, don't say it...) was the hardest for you?

And, besides -17 (which I haven't got yet...), you could start getting trillions of points in SS mode.

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222,789,606,763,150 SS Infinism
6,012,954,216,350 Combo
272,576,161,438,400 Accumulated

Yeah im still in the game that gave me my last achievement so I can't upload it yet :-(
The hardest? Ehm well prodigy was the last one and it took me the longest but after I found out that you have to do it in starshine mode it wasn't that hard anymore. I think...whats it called?...getting 3 supertrisms in al row, that one wad hard!
-17 here we come!!! I also want those trillion points,om getting the hang om starshine mode so maybe soon!

getting 3 supers in a row is called oracle

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-11 syllogism, 20,661,106,795 infinism, 72,670,819,049,876 Overall score, 2,576,980,379,100 Combo, 3,370 games played, Ranked 6th overall

Yeah, oracle was pretty hard - you even posted about it ;).

And for Prodigy, I kinda "toughed it out" until I got 90 thousand, then I got some huge combo that gave me 10 billion... SS mode is infinitely easier for Prodigy...

And getting -17 is extremely hard - it took me months to get -13...and Demiforce is not liable for iPods/iPhones smashed against the sides of desks via frustration in syllogism...

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222,789,606,763,150 SS Infinism
6,012,954,216,350 Combo
272,576,161,438,400 Accumulated

Even after this long time since the release - Overachiever still is a remarkable accomplishment. Congratulations!

The last achievement I got before recieving Overachiever - which I assume was the hardest for me - was Flash in the Pan. I was so focused on not running out of moves in higher levels, that I just couldn't get myself to do the exact opposite.
Oracle was a fluke for me, but I imagine it pretty hard to do intentionally.

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There is a theory which states that if anybody ever discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened.

How to behave on an internet forum

I composed this list a while ago while intentionally rating just my perception of their difficulty. I didn't particularly rate them how I got them (Conga Line was actually one of my middle ones - it happened through luck... same with sprinter - on first try although I would think it would be very hard) or how it objectively "is" b/c people have different opinions.

But the hardest achievements I found (and worked longest on)

Brainiac/Genius: I found these achievements to require the most effort, completing thirty extremely tricky levels. And trying to get them under par...
Flash in the Pan: Too luck oriented - not really enough skill.
Veteran: It kind of seems silly now as I don't really care about 50 million extra points on my combos, which are millions of times larger... But when I got it it was one of the longer ones, although it wasn't that hard.
Hexism: I picked up Trism around early December/late November. I joined the forums on January 1st. I had already gotten Hexism once I joined the forums. I found hexism(is this a proper noun?) relatively easy to get, but extremely hard to strategize. I didn't know about the video, so I had to make a virtual trism board in Illustrator and try to map it out. Once I found how to do it, it was easy to do.

btw kami: Your link doesn't work to your "how to behave on an internet forum" video because the video has been removed. I tried viewing the "internet chatrooms" video - but it's the same thing. So maybe you could link to the chatroom video because it is the EXACT same thing as the forums one...

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222,789,606,763,150 SS Infinism
6,012,954,216,350 Combo
272,576,161,438,400 Accumulated