I'd really love it if someone came up with a nice timeline type link if there is one. But to the best of my knowledge, that's not available.
However, I just realized the wikipedia entry is probably your best bet. It does kinda favor the meta-story (as in referencing journalists writing about gamergate, rather than referencing directly to 8chan/twitter/KiA), so misses some points (mostly examples of gamergate-behaviour, their modus operandi, talking points etc.). But last time I checked it was pretty spot on in terms of what the overall picture is. Even if it's not necessarily in a timeline format.
http://en.wikipedia.org/wiki/Gamergate_controversy
Edit2: I'd say a_man_in_black's storify's are also a great resource, dude's analysis is usually top notch (can't vouch for all of them, tho, since I've only read the ones posted here). https://storify.com/a_man_in_black
A timeline of some of the shit that GG's done over the past couple of months would be really great, with links and everything. Tempted to try and at least compile a list of links showing this kind of stuff, but I am not the most effective at Googling.