Here is the full list of all 10 War of Criminals achievements.
Make 25 headshots from any weapon
Deal 900 damage total from any weapon
Finish 10 games wearing any hat
Win 3 games in a row
Kill 5 enemies in one game
Survive staying in the smoke for at least 10 sec
Be the 1st to die
Win 3 games
Use 10 first-aid kits
Complete the collection