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