FIRST KILL
Kill 1 zombie
BUTCHER
Kill 2.500 zombies
TERMINATOR
Kill 10.000 zombies
FULL METAL JACKET
Max a tower
FIRST TECH CENTER
Build a tech center
MY FIRST RESEARCH STUDY
Research a new tower
ARMED TO THE TEETH
Complete the tech tree
FIRST ARMS FACTORY
Build an arms factory
YOUR FIRST SUPER WEAPON
Use a super weapon
NO ONE CAN STOP ME
Use 4 different super weapons in a single mission
FIRST PERK
Earn 1 perk
HIGH FIVE
Earn 5 perks
ALL OR NOTHING
Earn all perks
FEARLESS
Call an early wave
CONSTRUCTOR
Build 50 towers
ENGINEER
Build 100 towers
ARCHITECT
Build 500 towers
TOWERS? WHICH TOWERS?
Win a mission without building a tower
PHOTOGRAPHER
Take a screenshot
PARAMEDIC
Heal a crew member
ALPHA LEADER
First special force
PRACTICE, PRACTICE, PRACTICE
10 special forces in one mission
TRAITOR
Kill a mutated crew member
HELL YEAH
Kill 20 zombies in FPS mode
DON'T HURT ME
Build the lander shield
MASSACRE
Kill 25 zombies at once by nuke
LASER MASTER
Kill 200 bomber by laser tower
LORD RAIDEN
Deactivate 30 electro shields by tesla
SUB-ZERO
Extinguish 20 pyro zombies by freeze ray
STOP!
Stop 10 runner zombies by freeze ray
A SPACE ODYSSEY
Analyze all monoliths
UNLOCK THE TRUTH
Use all monoliths in mission 20
THE END
Complete the campaign
THE CHALLENGING END
Complete all missions of the campaign in challenge mode
ALMIGHTY
Unlock all achievements