Here is a list of items that can be acquired during the GW2 Halloween event and will be gone once the Halloween event ends on Nov 1, noon PDT. Most of these items will still be available on the trading post but expect the prices to go up gradually.
A list of maps and locations for the pumpkin carving achievement as part of the GW2 Halloween Event. You will need to carve out 150 pumpkins for the Pumpkin Carving achievement and Master Carver title. Note that this achievement is account bound and can be done with multiple alts in Lion’s Arch
GW2 Coddler’s Cove jumping puzzle guide with detailed instructions and video walkthrough. Coddler’s Cove is a new jumping puzzle introduced with Halloween patch and is located in Timberline Falls SE corner. The puzzle is fairly annoying but thankfully very short. Special thanks to Snow Luna who showed me the location of this puzzle!
GW2 Hidden Garden jumping puzzle guide with detailed instructions and video walkthrough. Hidden Garden is a new jumping puzzle added with the Halloween Patch in an area of Mount Maelstrom called Dierdre’s Steps. This jumping puzzle can be accessed via four portals in Mount Maelstrom and has some of the best scenery out of all the jumping puzzles.
GW2 Tribulation Caverns is a new jumping puzzle introduced with the Halloween event. It is a puzzle located in SW corner of Dredgehaunt Cliffs, just behind the vista/jump puzzle for Tribulation Rift Scaffolding. You will have to sucessfully complete Tribulation Rift Scaffolding to gain entry to the caverns.