Going Up

Nashal's Watch is located to the northwest of Aggramar's Vault, indicated by the huge statue on the Stormheim zone map. You can find the ramp that leads inside the statue at around 42,1-35,8.

The rare mob indicated by the star mark with a bottom arrow is down below in a cave. He's not part of this achievement.

Anyone else thought Blizzard would be trolling and the stairs were infinite?

I ran up there because the rare, Egyl the Enduring, located on the minimap... but there rare is actually in a cave below the statue.

Going Up is one of those easy to do / just for fun achievements. Actually you don't even need to do anything. Just visit a cave at 42, 34 (map) and go up. If you see this https://i.gyazo.com/413abbc91091e83aeca962c3b0f914e6.png huge statue, you are in the right place.

Here is demo video if you still can't find this place: https://www.youtube.com/watch?v=tMFjdulvo-E

Easy, just like Going Down?;p

Ps. There is a rare Egyl the Enduring from another side (right-down), under the axe of the Nashal's Watch. He is part of the Adventurer of Stormheim. Here is his cave entrance: https://www.youtube.com/watch?v=Opv2KgZZz6Q Coordinates are 41.4, 31.9