Here is the full list of all 12 Tiny Rails achievements.
Travel 1,000,000 km/622,000 miles.
Upgrade 50 cars of any rarity.
Earn 25,000 gold by selling cargo at Markets.
Upgrade 100 Stations.
Collect 30 rare train cars.
Earn 1,000,000 gold.
Purchase 75 train stat upgrades.
Collect 45 train cars of any rarity.
Visit 250 Stations.
Buy 400 cargo items from Markets.
Take 1,000 Passengers to their destinations.
Take 250 VIP Passengers to their destinations.