Get all other trophies.
Starting, complete any level
Kill 5 enemies with a single grenade
Survive at least 5 waves in survival mode
Survive at least 10 waves in survival mode
Use your secondary weapon
Eliminate one of the bosses
Destroy a tank
Kill 10 Heavy soldiers
Kill 25 Engineer soldiers
Kill 3 enemies with a single grenade
Kill 50 Infantry soldiers
Heal yourself or heal someone else
