This achievement is a bit buggy
The only reason that this achievement is in the very hard section is that it is bugged. Only barrels broken with melee attacks count. This means that wand / gun shots, spells etc will not work. Unless you're playing Destroyer, keep a melee weapon on switch and break all breakables with it until you get the achievement.viewtopic.php?f=5&t=21485
Make sure you are connected to Steam. No offline mode.
Most achievements won't trigger until you zone or quit the game.
Achievement progress won't show up until you fully exit the game and Steam synchs up.
Sometimes they don't trigger the first time. (I didn't experience this, but it has been reported)
Press alt-tab to view your achievements while in game.
The Ironman Achievement is no longer in the game. You will not be able to get it. (There used to be 67 achievements)
The world is full of Kings and Queens
Who blind your eyes then steal your dreams
...it's Heaven and Hell, oh well