Here is the full list of all 30 Steampunk Tower 2 achievements.
Kill a total of 500 units
Complete a level without taking any damage to the tower
Hear the clock toll
Fill all 5 storeys with turrets
Complete a level with less than 5% Tower health remaining
Complete the main campaign
Complete all challenge levels
Complete a survival level without taking any damage to the tower
Kill a total of 5,000 units
Use all 3 Super Weapons in the battle
Start the mission with 3 bonuses
Send 10 trains at once
Capture each factory at least once
Build and upgrade all buildings in the town
Fully upgrade the Battle Tower
Find the Sea Monster
Earn 1000 Etherium in the missions for agents
Send agent to Copenhagen
Kill 1000 enemies by turrets super ability
Hit 100 times in the weak points of enemies
Capture 10 areas using autobattle
Kill 100 enemies in the shock
Kill 100 enemies in the fire
Kill 100 enemies by critical hit
Destroy 5 tanks by Machinegun super ability
Destroy 100 air units by Saw launcher super ability
Destroy 50 armored cars by Lightning super ability
Destroy 200 infantrymen by Heavy cannon super ability
Destroy 30 robots by Rocket launcher super ability
Kill 10 infantrymen with 1 shot of Saw launcher