And to answer your questions ---
I have all the basic achievements except for Gender Swap and Sausage Fest. (I'm waiting on those two for now. I think I have Achievement Post Traumatic Stress Syndrome, LOL. In the meantime, I'm dropping into this forum and helping others a little each week.)
Firestarter and Inquisitor were the most fun. I made a Ghost Rider avi with fiery hair, a skull choker, a black leather jacket, a motorcycle, and Smoldering Desolation as the background. And the poll was funny and related to the movie. (Option #6: You don't look a bit like Nicholas Cage!
xp ) AND I RODE MY MOTORCYCLE ALL OVER THE ACHIEVEMENT FORUMS posting in other people's threads and asking for help in return, which I got pretty quickly. People always do help when asked.
Did the same for Mega Thread and Thread Master, but with a beach-themed avi. (With surfboard!) Mega Thread was the most work, of course. I got a lot of help, but I probably made half those posts myself. That was okay, because I was used to bump contests and page contests.
Actually, the bump contests last year and this year up until March were how I got my Elocutionist. I certainly engage in a lot of conversation on Gaia, but it would have taken forever to get that achievement based solely on talk threads.