Chained Echoes

In order to unlock this achivement you will need to play almost the whole of the first act to unlock enough reward tiles. Took me about 20 hours of playthrough to get the 40th pretty much playing naturally (almost no backtracking or farming).
Naturally, you must first unlock access to the board itself which occurs....
Here on out you can look at the tiles to see the requirements and once you get 40 of them unlocked that are next to each other, this will pop. There is a counter at the bottom left of the reward board to make it easy to track.

Note: Not every tile for the region will be doable at the beggining and you may have to come back later to mop up when you are higher level.


If you need extra handholding, this is a good site:
https://www.neoseeker.com/chained-echoes/walkthrough/Rohlan_...

To get a chain you have to connect the golden squares in a line to gain a higher number.