Here is the full list of all 51 Bunker Defense achievements.
Destroy 1000 enemies in any mission
Eliminate a golden enemy
Have over 1000 Cash and over 1000 Fuel at any time
Collect a Mystery box
Collect 100 boxes
Collect an Ultra Rare box
Complete the game in Easy difficulty
Complete the game in Normal difficulty
Complete the game in Hard difficulty
Complete the game in Nightmare difficulty
Scrap an item
Scrap an Ultra Rare item
Craft an item from a Recipe
Unlock Romulus
Unlock Dr. Kuspov
Unlock Freyalise
Complete a mission without building any Towers
Unlock a Tower Upgrade
Upgrade a Tower
Build a Gauss Cannon
Complete Chapter 1
Complete Chapter 2
Complete Chapter 3
Reach Player Level 100
Unlock all Tower Upgrades and all Recipes
Amass 1000.000 Credits
Complete all missions in any difficulty
Complete all missions in Nightmare difficulty
Achieve a Perfect Victory
Achieve a Perfect Victory in all missions in Nightmare difficulty
Deal 100.000.000 damage with Towers
Craft every Recipe item
Complete any mission with 2 players
Complete any mission with 3 players
Complete any mission with 4 players
Have 5 items equipped at the same time
Complete any mission with 1 Health left
Sell a Material
Use any Commander's Ultimate ability
Reach Commander level 10 for any Commander
Reach Commander level 30 for any Commander
Have 300+ total Health at the start of a mission
Reach Commander level 30 with all four Commanders
Complete any mission in any difficulty in Blitzkrieg mode
Complete Radioactive Springs in Nightmare difficulty and in Blitzkrieg mode
Complete the Slime Nest in any difficulty
Destroy the Gluttonboys in Nightmare difficulty
Complete all missions in Nightmare difficulty and in Blitzkrieg mode
Complete the Ruins in Nightmare difficulty and in Blitzkrieg mode
Achieve a Perfect Victory in any mission in Nightmare difficulty and in Blitzkrieg mode
Destroy 10 Trains