Here is the full list of all 35 Insurgency: Sandstorm achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Drive a vehicle full of teammates for more than 15 seconds.
Capture 100 objectives.
Destroy an enemy air support vehicle.
Kill three or more enemies with a single grenade or explosive.
Navigate through chemical gas while wearing a gas mask.
Capture an objective as the last member of the team alive.
Call in fire support ten times as an Observer.
Successfully rig and destroy an enemy weapon cache.
Kill an enemy with a vehicle.
Kill an enemy with an enemy's live grenade.
Destroy an enemy vehicle with a mine.
Kill an enemy using the mounted weapon on a vehicle.
Kill an enemy driver with the mounted weapon of their vehicle.
Kill an enemy by bashing in a door.
Win a match of Firefight.
Be the Most Valuable Player of a round.
Kill an enemy while blinded by a flashbang
Kill an enemy with a knife.
Block an objective from being captured and then clear it.
Kill an enemy after blinding them with a flashbang
Kill an enemy by burning them.
Destroy an enemy weapon cache using a remote explosive charge.
Kill an enemy with the last bullet of your magazine.
As a Commander, kill an enemy using fire support.
Kill an enemy while vaulting.
Get the first kill in a round.
Win a match of Push.
Purchase your first item in the Appearance menu.
Win a match of Checkpoint.
Kill an enemy without using weapon sights.
Kill an enemy by shooting through something.
Kill 3 enemies with a headshot in a row.
Kill an enemy while they are reloading.
Kill an enemy right after performing a speed reload.
Complete the tutorial mission.