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I just started another game with ironman not ticked at the start and the achievements still show in the achievement tab in game.

i figured it out anyway, the latest beta patch isn't compatible with achievements as games started with it don't have the ironman save icon even with ironman ticked.
 
Yes, but is there a lock on the achievements? That means it's not ironman. IF it was, there'd be no lock on the possible achievements
 
Point still stands though, save needs to be ironman for achievements to work. Any game started with the beta patch doesn't allow ironman saves as i've just tested it.

Its cool anyway, i've just started a new ironman savegame without the beta update.