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