Here is the full list of all 28 Railroads achievements.
Complete one iteration of Railroads
Break 30 Wooden Barricades
Kill 100 Things in the Railroads
Run over 25 Miners using the Minecart
Repair a weapon to maximum durability using the anvil
Complete ten iterations of Railroads
Get Hippie to upgrade your weapon 5 times
Made it past the bird scouts and took the elevator down
Weakened Birdman by burning all of his pieces
Defeated the boss form of Birdman
Upgraded a weapon from Common to Rare tier
Upgraded a weapon from Rare to Epic tier
Completed the Pipe Tunnels room
Use a Thruster to push the minecart
Defeat 10 Elite Miners
Mined 100 veins of coal ore
Bait a miner into the pipe gas
Loot 10 Chests
Unlock a room of any kind using progress points
Evade Birdman 5 times
Complete the Bird Hall without being spotted once
Successfully picklock 10 locks
Turn a valve completely while being chased by Birdman
Finish a level under 25% HP and no bandages left
Burn a piece of Birdman while being chased by Birdman in the Graveyard
Damage Birdman by making him land on an obstacle
Complete the first chapter of Railroads
Murdered 10 Rats