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