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"one obstacle" is correct and usable in written English.
You can use it when referring to a single obstacle that is blocking your progress or success. For example: "Finding the motivation I need to start a new project has been one obstacle I've had to overcome."
Exact(57)
One obstacle: The taxes investors pay on dividends.
Unfamiliarity with a health-care system based on the RGP scheme could be one obstacle.
One obstacle: We're hoping he's worked on his English since 2013.
One obstacle is cost.
One obstacle is clear, though.
One obstacle is due diligence.
One obstacle to greater achievement was Peliwo.
One obstacle involves which nations should attend.
But there was one obstacle.
Fear of piracy is just one obstacle.
Just one obstacle remained: Electroshock Therapy.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com