What the achievement asks
Become the victim of a workplace accident in the Forgegrounds. Five points.
It is a joke achievement. You climb into an industrial press and let it flatten you.
Where to stand
The Forgegrounds are underneath Dornogal, on the Isle of Dorn. Go in through the entrance at roughly 47.58 59.67 and make your way to the central forge, in front of Darean, the blacksmithing trainer, at roughly 49.76 61.28.
You will know you are in the right place by the pile of skeletons underneath the machine.
What to do
Wait for the press to rise, then stand on the plate underneath it. When it comes down, the achievement is yours.
There is nothing to fail and no penalty beyond the obvious. Darean even comments afterwards, wondering aloud whether people simply do not look where they are going.
That is the whole achievement. It takes about thirty seconds once you are in the room, and most people who have it found it by accident while wondering what the machine did.
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. You are in Dornogal constantly, so there is no reason to leave this one for later.