Here is the full list of all 37 RAILGRADE achievements.
Construct 32 branches on a single region
Deliver 2048 units of water
Lay 8192 tiles of track
Ride a train traveling over 128 tiles
Salvage 1024 tiles of track
Produce 1024 energy
Construct 128 trains
Establish a region generating 4096 profit per minute
Salvage 32 branches
Produce 1024 Crude Oil
Finish the first optional side mission
Lay 1024 tiles of track
Construct 16 trains
Salvage 32 tiles of track
Lay 128 tiles of track
Run the smallest train possible
Finish a mission while losing money
Ride a train traveling over 32 tiles
Complete a region with only 1 train
Build your first train
Finish the campaign
Construct 4 new Deer
Lay 1024 branches
Construct 512 trains
Produce 64 Energy from Geothermal
Launch 16 WorkRockets
Upgrade industries 256 times
Upgrade water pumps 32 times
Grow a city to max level
Upgrade an electronics fab to max level
Upgrade 10 coal mines to max level
Upgrade 5 incinerators to max level
Run a single train of over 16 length
Deliver 2048 units of Steel
Export 64 Energy per minute from an Export Dock
Export 32 Mainframes per minute from an Export Dock
Construct 64 new Deer