20 hour achievement

[TheBuck]

I have 21 hours in but the 20 hour achievement along with some others are locked, anyone have any ideas why?

[Dan Longname]

Some say that the game has a built-in hidden timer, that runs only when you're inside the castle and the game isn't paused.

[TheBuck]

Oh, well if that is the case I wish there were a way to find out just how much time youve spent in there. Thanks.

[Menacer]

If you beat the game it shows time played.

[The Cannibal]

Yeah, I think its an internal timer, because my achievement triggered at about 22 hours.