Out of Ammo achievements

3.33%
Florence Nightingale
Assist 20 enemy casualties
3.33%
Splash Damage
Kill 5 units with a single rocket
3.33%
Overwatch
Beat the Sniper Challenge Mission
3.33%
Trouble in the Tropics
Beat Wave 20 on the Desert Mission
3.33%
Deadly Docks
Beat Wave 20 on the Port Mission
3.33%
Vertigo
Beat the Penthouse Challenge Mission
3.33%
Icarus
Beat the Plane Crash Challenge Mission
3.33%
Colonel
Survive for 30 minutes in a single round
6.67%
Panic in the Pines
Beat Wave 20 on the Forest Mission
10.00%
Ready for Battle!
Complete the Tutorial
10.00%
Suppressing Fire
10 kills while using a machine gun emplacement
13.33%
Last Resort
2 kills while possessing a medic or engineer