Here is the full list of all 39 IS Defense achievements.
Survive 10 minutes on Saint Tropez
KIll 30 000 terrorists
Finish desert level
Survive 20 minutes on harbor
Call the helicopter support 30 times
Survive 10 minutes on harbor
Destroy the fishing boat on beach level
Fire 1000 rockets
Call the air strike support 40 times
Survive 20 minutes on the beach
Call artillery support 50 times
Destroy 30 landing crafts
Get all upgrades
Max the support skill branch
Max the rockets skill branch
Survive 20 minutes on the desert
Destroy planes on the desert level
Max the player skill branch
Survive 10 minutes on the desert
Destroy 1000 vehicles
Destroy 250 Hummers
Kill 10 000 terrorists
Destroy 100 pontoons
Call infantry support 100 times
Finish harbor level
Destroy 500 vehicles
Max the machine gun branch
Deliver 100 headshots
Call the cargo support 100 times
Finish beach level
Destroy the Scooby mobile
Destroy 200 vehicles
Survive 10 minutes on the beach
Kill 3 000 terrorists
Destroy 100 suiciders before they detonate themselves
Let 100 pontoons land on the shore
Finish the game
Finish Saint Tropez level
Survive 20 minutes on Saint Tropez