ANet should really replace or fix this achievement. I went through forging steel twice due to the clue being the scrying pool but that was the only option in the pool for me. Next I ask chat and some people who mention getting the items in hatchery/cragstead and doing the story bits. Did that and still nothing. Now I find this thread saying to try more things.
For the most part I've been enjoying the return achievements, it's nice to replay the story and even getting some challenging puzzles, etc was fun. This on the other hand feels like trying to fix something that is broken. It's asking people on guild or map chat, nobody really knows for sure. You google and wiki and there's no clear information. I've spent hours on this and it's just pure frustration.