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