The game surpassed all first and third-party games to achieve the honour, announced Journey creator Jenova Chen.
"Thanks to you, Journey has officially broken PlayStation Network and PlayStation Store sales records, surpassing all first and third-party games to become the fastest-selling game ever released in the SCEA and SCEE region on the PlayStation Network," writes Chen on the PlayStation Blog.
"We have received more letters from fans in the two weeks since Journey's launch than we did for Flower over the past three years!" he added.
Chen also revealed that the game's official soundtrack, which was composed by Austin Wintory, would be released in digital form on April 11, with a CD release to follow.
"I'm happy to announce that the soundtrack will be hitting the PS Store and iTunes on April 11, and there will be a limited CD release in the near future as well."
Journey is available to download from the PlayStation Network for £9.99/$14.99. The game sees players guide a mysterious robed figure across a vast desert to an alluring mountain in the distance.
It features online co-operative gameplay, enabling users to interact with each other and the wider world, in order to uncover an ancient civilisation.
> Journey: Designing for Friendship - feature
> Read our five star Journey review
Watch a trailer for Journey below: