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 opened and used the Real-time Minimap.
You took a swim - this doesn't look to be good for your vehicle, by the way.
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.)