Haven't got an achievement

[wide surge]

I already maxed the temple but don't get the achievement. Whenever I enter the menu again, there is that little exclamation mark on the symbol o,o
1.3.5.382

[austere condor]

Does the outside of that temple have that icon on it? Because you might have to upgrade it one more time otherwise.

There is one more upgrade to do after you fill the progress bar, and you can see the cost of it on the right side of the scree, indicating that you haven't done it.