Here is the full list of all 21 Saimai Rd achievements.
Build 250 roads
Build 1000 roads
Build 20 roundabouts
Build 100 roundabouts
Deploy 250 cars
Deploy 1000 cars
Travel 100K tiles on road
Travel 1M tiles on road
Build 100 rails
Build 500 rails
Deploy 20 trains
Deploy 100 trains
Travel 10K tiles on rail
Travel 100K tiles on rail
Deploy 100 boats
Deploy 500 boats
Travel 10K tiles on water
Travel 100K tiles on water
Deploy 10 planes
Deploy 50 planes
Import 10K items by plane