What the achievement asks
Complete seventeen weekly quests on the Siren Isle. Ten points, account-wide.
Three weeks minimum, and not because you are slow
The Siren Isle rotates between three invasions, and each week only the quests belonging to that week's invasion exist. There is no way to see all seventeen in one week, so this achievement takes at least three weekly resets however much you play.
That makes it one to start on the first day you set foot on the isle and forget about, rather than something to grind.
Which quests belong to which week
Vrykul invasion
| Quest |
|---|
| Legacy of the Vrykul |
| Historical Documents |
| Rock 'n' Stone Revival |
| Longship Landing |
| Secure the Perimeter |
| A Ritual of Runes |
Naga invasion
| Quest |
|---|
| Serpent's Wrath |
| Ruffled Pages |
| Crystal Crusade |
| Beach Comber |
| Three Heads of the Deep |
Pirate invasion
| Quest |
|---|
| Tides of Greed |
| Cannon Karma |
| Pirate Plunder |
| Ooker Dooker Literature Club |
| Silence the Song |
| Cart Blanche |
The first quest of each block is a world quest and the rest come from the isle itself.
Do all of the week's quests while that invasion is up, including any you think you might have done before. Missing one means waiting three weeks for its invasion to come round again, which is a much worse trade than fifteen extra minutes now.
Two of them unlock something else
Two of these weeklies are also the only reliable route to a pair of gems in A Choir of Citrines: Serpent's Wrath awards the Seabed Leviathan's Citrine, and Tides of Greed the Legendary Skipper's Citrine. Players who bought those gems from a vendor and got no credit finished the criteria only after doing the matching weekly.
Where it fits
One of the pieces of You Xal Not Pass, which rewards the Shadow of Doubt mount and is part of Worldsoul-Searching, the War Within meta.