Full list of all 6 Project Speed achievements. It takes around 0-1 hour to unlock all of the achievements in the base game on Windows.
The base game contains 1 achievement, and there are 3 DLC packs containing 5 achievement.
Successfully completed the Hill Climb! You are now King of the World!
You took a swim - this doesn't look to be good for your vehicle, by the way.
You opened and used the Real-time Minimap.
You played the game for more than one minute.
You found your way to Njarovik. (Requires Njarovik DLC)
You drove the Steampunk Car - you're now Going Steampunk! (Requires Steampunk Car DLC - Additionally, this achievement can be gained without the DLC by colliding with the Steampunk Car in-game with another vehicle.)