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