What the achievement asks
Open all six of Mardivas's puzzle chests in Nazjatar. Ten points, account-wide, both factions.
There are two kinds of chest, leylocked and runelocked, in three difficulties each. Six criteria, six separate chests.
| Chest | |
|---|---|
| Easy Leylocked Chest | Easy Runelocked Chest |
| Medium Leylocked Chest | Medium Runelocked Chest |
| Hard Leylocked Chest | Hard Runelocked Chest |
The difficulty is the waiting, not the puzzles
Every one of the six appears as a world quest, and a chest that is not currently up cannot be opened at all. You do not choose which one to do: you check what Nazjatar is offering and take whichever of the six happens to be on the board.
That is the entire achievement. The puzzles themselves are solved in a couple of minutes each. What takes weeks is waiting for all six to have come round.
Check the Nazjatar world quest list every day. Missing a hard runelocked chest because you did not look can easily cost you another fortnight.
Do it while you are there anyway
Nazjatar has enough daily work that checking the board costs nothing. Anyone working on Subaquatic Support is already looking at the same list of quests every day, and Nazjatarget Eliminated is gated the same way.
Treat all three as one habit rather than three chores: open the map, see what is up, take what you still need.