Lock, Stock and Two Smoking Goblins

If you wear the reward title continuously for a week (a week /played, not a calendar week), you will unlock a hidden Feat of Strength.

If you were like me and trying to find the starting quest for this on Legion Remix, it is actually located in Dalaran by the bank.

This achievement is a sequel to the short side story What a Ripoff!, we can finally get our recompense to the swindler goblin duo in Stormheim.

Requirements:

• Character level 110
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• Completion of What a Ripoff!
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• Time to Collect, offered in Dalaran after you complete What a Ripoff!
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• [item=138111], which can be picked up in all major hubs of Stormheim.
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After you obtain the Grapple Launcher you can climb up to Watchman's Rock through a series of grapple points, started from the northern end of the isle (coords: /way 68.5 20.2) On the rock you can finally confront [npc=110038] and [npc=110039].

The fight is somewhat reminiscent of the GG Engineering encounter in Brawlers's Guild, the goblins are separated and while you're fighting with one the other one is spamming bombs on you. Both have ~10mil HPs and a set of special abilities, particularly [spell=219614] and [spell=219848] that must be encountered. They're soloable but if you don't like challenging encounters that take some time there's always be an easier way to kill them in a party.