I am currently one of 1% to finish the whole thing according to Steam achievements, lol! It wasn't that hard.
One percent after only three days is actually a good interest of the community

. For example, the achievement for discovering every city in West Balkans (released a year ago!) is done by only 0.6% of owners, and only 2.8% of players have used the river ferry in Romania (from DLC released
five years ago). In general, a lot of people don’t go far in the game — I see only 63% of
ATS players have bought their own truck, and only 67% have used the filling station at least one time

.