Perhaps this helps:

Upper half
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1440871132

Lower half
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1440871094

Cool, thank you! Now I see what I'm missing. Those 3 in the top left and the one in the square at the bottom. They are locked behind etheral maps but at least it's not too bad, I was afraid they'd put some in the far corners. Thanks!

Well actually I now have all those that you have but still no achievement unlocked. In fact on your lower half screenshot you are missing one map on the far bottom left corner. So I'm guessing there are more hidden =/

Yeah I don't have the achievement yet either. I wonder what counts as story map. Perhaps all maps which give bonus rewards (when you can choose from 3 rewards)?

One time I completed an ethereal map and it unlocked a secret level "Hadron Collider" which offered 2 rewards. Unfortunately, I had to fix / restart steam and in order to do so quit out of the map and restart the game. When I loaded back up the map and my chance to complete it was gone.

So I'm left wondering whether that map is necessary.

Ive got the achievement, so, these should be all:

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1440966853
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1440966804

Thank you Sir!

I am only missing in the lower right the 2 maps 'Mang' and 'Old Road'.

Is it pure luck to get the ethereal brigde maps, or can I influence it?

I don't play any ethereal map that is not a bridge to some place I haven't been to reduce the number of locations the next maps can spawn in.

It really sucks to wait for the appearance of the last story maps. After finishing the main boss I'm playing over 8 h and I don't get the needed random bridge maps.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1442793256

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1442792992


Advice to newbies: Do it right from the start!

Originally posted by nbst:

I don't play any ethereal map that is not a bridge to some place you haven't been. This reduces the number of locations the next maps can spawn.

Sup folks,

So there's a way to get lots of maps - FAST - that avoids all that horrific grind. I'd played the game pretty much to completion and got barely any maps before I found out about these hidden levels so I get the frustration of everyone here.

I found a custom map - basically a tier 21 map with 99 waves where every wave has 100 horsemen and the path pretty much guarantees they'll fall into lava if you follow the instructions. Workshop maps don't count towards xp (or achievement progress I think) but you do get to keep the items, and running this map properly netted me roughly 12 full pages of items with 6-15 maps each time.

I put down a few teleport runs and traps near the end of the path to make sure nothing got through.

Hope that helps :) I just got all the achievements thanks to this so can confirm it works.

Well I went through all this stupid ♥♥♥♥♥♥♥♥ to try to finish off the achievement since I never even knew about ethereal maps linking campaign maps... it really ought to be clearly spelled out... I've put in over 500 hours in the game and I'm on A13 and I still didn't know.

Anyhoo.... long story short, Old Road and Mang will not appear for me at all, no matter what I do. I got every other map but Old Road and Mang won't appear at all despite having the correct linking maps. I've cleared the linking maps several times, nothing. Oh well.

edit: I'm level 2500~ in A13 and clearing the level 100+ ethereal maps (several with 400+ waves) to do this was annoyingly boring. I agree with the point earlier -- definitely do it early. Assuming it still works.

edit: I finally got Mang to appear just now but the other one, Old Road, remains stubbornly hidden. No idea why.

edit2: Old Road is next to Mang on my map (one square higher up), it is not where it was on your map posted earlier. It appeared after I cleared Mang.

edit3: Ok got it and Reaper of Objectives which I also didn't know existed apparently I have 100% achievements in this game now since apparently those were the only 2 I didn't already have. On to A14, and thanks for the map screenshots earlier, they were definitely of some help in making sure I tagged them all!