GW2 Dragon Bash New Achievements Guide

Four new achievements will be available. These will need to be completed in order: Ceremony and Acrimony, Hard Boiled, Every Piece Matters and No More Secrets. A fifth achievement, Case Closed, helps track the story, but does not count towards the The Dragon Bash Experience meta-achievement.

Dragon effigies have been placed in all of the explorable maps for levels one to 35. Perform a ritual dance in front of an effigy to gain a 2% health boost. These health boosts can stack up to 10% as you channel the ritual dance skill.
You’ll be directed to the effigy lighting ceremony, a single-player instance called Memories on the Pyre, where the Captain’s Council of Lion’s Arch and cultural representatives from the different races of Tyria will light the effigies in the Grand Piazza on fire.

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Next, another mail from Marjory indicates that the last two suspect have been found: Trembling Song in Snowden Drifts and Astorra in Caledon Forest. Again, these suspects won’t need to be taken by force.
Return to the Grand Piazza and talk to Kiel to enter the Scene of the Crime again. Marjory will retune her Investigation Kit for the combined arcane residue of all of the collected samples. Upon retesting the suspects, all suspects will be exonerated except for one. When that suspect is scanned, their hands will glow with arcane residue. Revealed, the suspect will confess and call down their crew to cover their escape.
After defeating the attack, talking with Kiel will complete the story and give you Marjory’s Journal. Marjory will tell you she’s heading back to Divinity’s Reach.
If you return to the Dead End bar, Marjory and Kasmeer will each have a small, optional follow-up conversation with you.