This acheivement is for collecting enough studs in any level to reach "true hero" status.
You will notice that as you collect coins, a bar appears at the top of the screen and starts to fill up, turning gold as it goes. Once it is full the game will confirm true hero and the acheivement will immediately pop.
Silver coins are worth 10, gold 100 and blue 1,000. If you play this through you will get it without fail, as when you start to unlock the multipliers you can get it within seconds of the level starting.
That said, I managed to get it on the first level, by breaking everything and collecting everything, so you can get it on level 1 if you are patient enough!! Good luck!!