Kill 1,000 enemies

Kill 5,000 enemies

Kill 10,000 enemies

Save 10 scientists

Save 30 scientists

Escort 10 soldiers

Escort 30 soldiers

Repair 10 weapons installations

Repair 30 weapons installations

Kill 100 enemies with grenades

Kill 30 enemies with explosive barrels

Earn $1,000,000

Kill 50 zompods in ground missions

Kill 150 zompods in ground missions

Upgrade a soldier to level 20

Win the game

Unlock and fully upgrade all weapons

Reach a 50% XP multiplier

Get 10,000 XP in one mission

Max out a single stats on a soldier

Fully upgrade a weapon

Complete a ground mission on the last meteor using a single soldier

Complete a mission using a single soldier, without taking any damage

Win the game with an hour left on the clock

Win the game with 50% of the population remaining

Win the game without losing a soldier

Be chased by an enemy for 30 seconds