Speaking to CVG, Remedy's head of franchise development Oskari Hakkinen revealed that the recent PC release has pushed the game past the milestone, indicating the slow-burning appeal of Alan Wake.
Originally released on Xbox 360 in 2010, the game tells the story of a troubled writer who is seeking his missing wife in a sleepy American town, only to encounter strange and possibly supernatural phenomena.
Mr Hakkinen said Alan Wake has become something of a "cult classic", adding that the series remains close to hearts of the team at Remedy, which also created the Max Payne series.
"People who have played and enjoyed the story feel the urge to tell their friends and other gamers out there that they need to try this experience, they need to play it," he explained.
The Remedy representative added that he believes the success of Alan Wake and its recent downloadable spin-off Alan Wake's American Nightmare shows the series still has some life in it yet.