Achievement for ladder simulations won't update

[Vlevo]

nick mentioned somewhere you need to do certain things to cause it to update. Such as repeatedly clicking on the sound control (there are other things that happen as you play normally, but clicking multiple times on the speaker button in the corner of the codecombat area (dungeon/desert/etc) screen is easily controlable by you (does it for me))

from here

You should eventually, get the “Citizens of Ladderville” achievement announcement. usually only takes a couple of cycles around the possible settings…