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 4000 flying-type bugs.
Destroyed 2000 flying vehicles.
Defeated 40 king spiders.
Cleared all stages on Hard difficulty as a Ranger.
Defeated 360 Retiarii.
Cleared all stages on Hard difficulty as a Fencer.
Destroyed 5000 flying drones.
Defeated 120 shield bearers.
Defeated 2400 Dragons.
Destroyed 6 flying-type bug nests.
Defeated 24 queens.
Destroyed 900 Hectors.
Destroyed 200 underground tunnel exits.
Defeated 24 death queens.
Wing Diver's health has reached 550.
Defeated 200 Deroys.
Ranger's health has reached 1000.
Defeated 20,000 ant-type bugs.
Fencer's health has reached 1250.
Obtained 50% of all available weapons.
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.
Reached a height of 200 meters.
Obtained 10% of all available weapons.
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 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 Hardest difficulty as a Fencer.
Cleared all stages on Inferno difficulty as a Fencer.
Obtained all available weapons.
Destroyed 500 carriers.
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 30 Erginuses.
Destroyed 6 Brains.