Here is the full list of all 50 Train World achievements.
First steam locomotive purchased
First diesel locomotive purchased
First electric locomotive purchased
Create a line with at least two stops
2 cities connected
2 industries connected
Build a long bridge (200 m)
Build a long tunnel (200m)
10 trains in use
20 lines in use
10 cities connected
10 industries connected
100 trains in use
Unlock all items in 1st era research
Unlock all items in 2nd era research
Unlock all items in 3rd era research
Connect all cities in the region
Connect all industries in the region
Earn 1M from freight
Earn 1M from passengers
Reach 1B company value
Have a train with 100 passengers
Have a train with 300 passengers
Reach 100M company value
Reach 120 km/h speed
Have 3 active loans
Have a station with 500 passengers waiting
Have a train with 300 units of cargo
Have a train with 1000 units of cargo
Have a train with 20 cars
Have a train with 50 cars
Have a train with 100 cars
Have a line with 2 trains
Have a line with 5 trains
Reach a top speed of 300 km/h
Connect all capitals on the map
Have a steam engine in 3rd era
Complete a task
Complete 10 tasks
Produce machines
Reach 2nd era
Reach 3rd era
Unlock all regions on a map
Complete tutorial
Have only electric locomotives running
Replace 200 cars in bulk replace at once
Connect 10 cities in one line
Take a 100M loan
Connect 5 cities from 5 different regions in one line
Deliver 10 different cargo types on one train