Are you perhaps confused about the past? The splitting of the anniversary events has been going on for quite some time - newer stuff for the first month, older (5-13 including fableds) for the second. The group of 4 thing did happen, but it's been a long time since it was done like that. All the 20th stuff is permanent so you can do that at your leisure. If you have 19th (or earlier) things you want to do, I'd concentrate on that first.
You don't have to purchase anything from the Marketplace to work on that achievement. There is another way...
Defs not intended. This has been fixed internally. We will do what we can to push out the fix to Live soon(tm). Edit: peer passed
Am I to infer from this statement that we are expected to relish the memory of the launch of our beloved EQ without there being a hotfix?
Only the 25th step missing now, that's in Skyfire (RoS) but we can't figure out where. The big dragon skeleton at -20, +2200 (south of the west lava river, with 4 mobs in it) looked promising but to no avail. Was anyone able to complete that step ?
OK I figured it out thanks to Gorran's post on Zam, this one was tricky ! For people looking for spoilers, here is the quest page on Zam.