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