Originally Posted by Agent Aero
3- Spider Farming glitch, but it still takes 50-200 hours (In my case anyway). (Link).
Or visit the achievement trading thread, HERE
in my case, I only got the first 2 elite items (helmt + boots?) from the spider and loads of elite runes. I then switched to farming Grendel (with tokens!!) and got all the remaining set pieces. Still took some hours though.
Personally, I think Grendel farming is better, as it also will help you towards other achievements ... make sure to get the tokens though first and quit the game if nothing drops to prevent the tokens from getting reset.