The interesting thing on trying to determine normal is that if you use steam achievements as the proxy, then it turns out the average player hasn't yet won a single game.
The closest to average achievement (half with it and half without) is City of with 50.1%.
But we also see that only 87.7% have achieved treasure hunter.
We also see that 34.5% has completed the tech tree, which is far higher than any of the achievements that require having won the game. (Exterminate! Exterminate! at 28.4% is the most common victory achievement followed extremely closely by Taking off the Training Wheels at 27.5%.)
The closest to average achievement (half with it and half without) is City of with 50.1%.
But we also see that only 87.7% have achieved treasure hunter.
We also see that 34.5% has completed the tech tree, which is far higher than any of the achievements that require having won the game. (Exterminate! Exterminate! at 28.4% is the most common victory achievement followed extremely closely by Taking off the Training Wheels at 27.5%.)