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