Defeated 20 Battlefield or Mechanical mosquito.
Defeated 30 armored guard's.(BlackSilverGuardian)
Defeated 10 Death Claw or Observer.
Destroyed a Mechanical Destroyer.
Total number of Cores reached 75.
200 kills in Defensive warfare.
Death by driving a mecha.
Alex's first use of skills.
Salman's Shield takes 2500 damage.
Li Ying used skills 3 times.
Defeat the final BOSS-BERSERKER
Drive mecha, trample to kill 30 enemies
Destroy 50 machine soldiers with melee attacks.
Completely upgrade one weapon.
Use specialist weapons for the first time.
Destroy 4 machine soldiers at once with a grenade detonation.
Accumulatively destroyed 6 UFO fighter.
Hit 3 times by any large mecha.
Defensive warfare adhere to 5 waves of enemy attacks.
Accumulated player deaths 25 times.
Complete the Campaign on any difficulty.
Destroy 1 UFO fighter with a grenade detonation.
Unlock 4 specialist weapons.
