Well I can't say all the settings you should choose (like audio and such), but if I were you I would "export quicktime" (actually I would do it with compressor, but you don't have that), then go to custom and use the h.265 (or h.264 when there's no h.265) for the codec. Set the resolution to 1920X1080 or HD if the option is there.
Now the size will not be huge, but it'll probably be big. And because it's not huge it will not be the best of the best quality. But this way it should be able to upload to vimeo.
Now there could occur a problem I often have with just regular sd. I always messed up the aspect ratio and resolution. I always got 4:3 ,instead of 16:9. When this occurs you can do 2 things; 1) set the resolution to 1920X1080 and the pixel aspect ratio to 1 (so the pixels are square), or 2) leave the pixel aspect ratio and make it 1440x1080 (didn't know the size so I just checked
wikipedia which says; 1440x1080 frame with 1.33 pixel aspect ratio), but that's for HDV, and you used AVCHD, and therefore AIC.
-- edit, removed grammar faults