I must have tried for this acheivement a million times. 
 
Ever since the patch it seems that cannon rushing is no longer viable (though that hasn't stopped me from trying) as well as immediately building two cc and lifting to two islands trying to mass bcs. I just seem to get overwhelmed. Can anyone give any advice?

Okay, I just got it using the Burning Tide map. Surprisingly enough this works:
 
 http://www.youtube.com/watch?v=iVMA0MmVm_g
 
However I would still like to hear how people are doing it post patc h without using this map.

I got it on Extinction, just built pylons in their middle and a cannon at the the bottom, then go highground and build more cannons, easy :D

i did one of those some time ago 
 
1. choose a map with an island expansion 
2. pick terran 
3. lift off and fly to island 
4. mass vikings/banshees/cattlebruisers 
5. ??? 
6. profit

I did cannon rush on Megaton, I think.  It was actually took me less tries to do 1v4 than 1v3 for some reason.