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