Here is the full list of all 46 Steel Rats achievements.
Unlock James.
Complete the outskirts district.
Complete the city district.
Complete the port district.
Complete the old town district.
Complete the scrapyard district.
Finish the game.
Unlock all rewards on all levels.
Unlock Randall.
Unlock Lisa.
Finish any level where Drones appear without killing any of them.
After unlocking the wheelsaw, finish a level without EVER using it.
Finish a Goon, Hatcher or Screamer by maneuvering a Spinner into him.
Be chased by one Spinner for 15 seconds.
Kill 10 Floaters while they are on the ground.
Finish a Goon with his own bullet by reflecting it.
Get hit by a train 10 times.
Outmaneuver an enemy into being hit by a Miner.
Get over 20 000 points on any level.
Complete all the extra challenges.
Perform a wheelie for 15 seconds in one go.
Reflect a shot while you are mid-air.
As James, kill a miniboss in the Battlegrounds without dealing damage with other characters.
As Toshi, only use the Junkpet to defeat all enemies on a level.
As Randall, kill a miniboss in the Hole without dealing damage with other characters.
Drive 500 meters while being attached to pipes in total.
Drive 1000 meters while being attached to pipes in total.
Drive 2000 meters while being attached to pipes in total.
Destroy 100 destructible objects in total.
Destroy 200 destructible objects in total.
Destroy 500 destructible objects in total.
Kill 500 Junkbots in total.
Kill 1000 Junkbots in total.
Kill 2000 Junkbots in total.
Kill 100 Junkbots in total using guns.
Kill 200 Junkbots in total using guns.
Kill 500 Junkbots in total using guns.
Spend 300 seconds in mid-air in total.
Spend 600 seconds in mid-air in total.
Spend 1200 seconds in mid-air in total.
After unlocking all characters, finish any level with only one character alive, downed to one chunk of health.
Find the hidden jukebox playing in Olbarrow.
Find the hidden jukebox playing in Halcyon.
Find the hidden jukebox playing in Lakeport.
Find the hidden jukebox playing in Warrensgate.
Find the hidden jukebox playing in Felyards.