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