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