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