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