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