Here is the full list of all 51 EARTH DEFENSE FORCE 4.1 The Shadow of New Despair achievements.
Destroyed 6 Brains.
Destroyed 20 Argos.
Cleared all stages on Hardest difficulty as an Air Raider.
Destroyed 5000 flying drones.
Defeated 40 king spiders.
Cleared all stages on Hard difficulty as an Air Raider.
Destroyed 12 quadruped fortresses.
Destroyed 6 motherships.
Cleared all stages on Normal difficulty as an Air Raider.
Defeated 120 shield bearers.
Destroyed 30 Erginuses.
Destroyed 200 large transport ships.
Destroyed 2000 flying vehicles.
Defeated 24 queens.
Destroyed 6 flying-type bug nests.
Destroyed 900 Hectors.
Defeated 12,000 spider-type bugs.
Defeated 360 Retiarii.
Defeated 4000 flying-type bugs.
Defeated 24 death queens.
Defeated 2400 Dragons.
Obtained 50% of all available weapons.
Defeated 200 Deroys.
Air Raider's health has reached 1000.
Defeated 20,000 ant-type bugs.
Rescued 50 other players in co-op play.
Destroyed 200 underground tunnel exits.
Cleared all stages on Normal difficulty as a Ranger.
Ranger's health has reached 1000.
Rescued 5 other players in co-op play.
Healed another player in co-op play.
Obtained 10% of all available weapons.
Reached a height of 200 meters.
Cleared all stages on Hard difficulty as a Ranger.
Cleared all stages on Hardest difficulty as a Ranger.
Cleared all stages on Inferno difficulty as a Ranger.
Cleared all stages on Normal difficulty as a Wing Diver.
Cleared all stages on Hard difficulty as a Wing Diver.
Cleared all stages on Hardest difficulty as a Wing Diver.
Cleared all stages on Inferno difficulty as a Wing Diver.
Cleared all stages on Inferno difficulty as an Air Raider.
Cleared all stages on Normal difficulty as a Fencer.
Cleared all stages on Hard difficulty as a Fencer.
Cleared all stages on Hardest difficulty as a Fencer.
Cleared all stages on Inferno difficulty as a Fencer.
Obtained all available weapons.
Destroyed 500 carriers.
Destroyed 150 red drones.
Defeated 20 Greater Wild Dragons.
Wing Diver's health has reached 550.
Fencer's health has reached 1250.