Full list of all 29 Out of Ammo achievements.
The base game contains 17 achievements, and there is 1 DLC pack containing 12 achievements.
Kill an enemy unit at over 800m
10 kills while possessing a sniper
2 kills while possessing a medic or engineer
10 kills while possessing a rifleman
Kill 5 units with a single rocket
Assist 20 enemy casualties
Survive for 30 minutes in single round on hard difficulty
10 kills with one artillery barrage
Survive for 25 minutes in single round on hard difficulty
Survive for 20 minutes in single round on hard difficulty
Supress or kill 7 units with the strafing run
Survive for 15 minutes in single round on hard difficulty
Survive for 10 minutes in single round on hard difficulty
Survive for 5 minutes in single round on hard difficulty
10 kills while possessing a rocket unit
10 kills while using a machine gun emplacement
Find and shoot all hidden targets
Complete the Tutorial
Beat Wave 20 on the Forest Mission
Beat Wave 20 on the City Mission
Beat Wave 20 on the Desert Mission
Beat Wave 20 on the Winter Mission
Beat Wave 20 on the Port Mission
Beat Wave 20 on the D-Day Mission
Beat Wave 20 on the Canyon Mission
Beat Wave 20 on the Contact Mission
Beat the Plane Crash Challenge Mission
Beat the Penthouse Challenge Mission
Beat the Sniper Challenge Mission