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