Connoisseur Achievement

Is there any way at all to gain this achievement?

The fact that I could end up with my achievement counter forever stuck at 286/287 just irks me. Accursed achievement OCD!

Thanks in advance!

I was the same way; being one achievement off bugged me. Luckily, earlier this year a fellow CivFanatic wrote a mod/script thing that allows any achievement, including this one, to be unlocked automatically. Even better, it's all written off of the source code available through the Firaxis SDK, so it's not "cracked" (and so isn't a questionable achievement unlocker program.)

Will it unlock every achievement, or just the one I want? Because I want to earn the others.

It will only unlock the ones you specify for it to unlock.