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