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Unless an achievement is marked as account-wide (i.e. blue header in the achievement window), you need to complete all the criteria on a single character. Once an achievement is completed, it shows on any character regardless of whether or not it's account-wide.
Insane in the Membrane isn't account-wide, so you need to earn every reputation on a single character.
Edited by Choonster on 9/21/2012 10:42 AM PDT
I think what the OP wants to know is if you have the different reps for the achievement on different toons can you get the title that way. I do not know personally if it can be done that way, but I would say you should get the reps on one toon just to be sure you get the title.
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