Alien Swarm: Reactive Drop achievements

11.07%

Stay Frosty

Freeze 6 Swarm with a single Freeze Grenade.

11.23%

Short Controlled Bursts

Complete a mission with no friendly fire incidents. Four marines must be present in the mission.

11.39%

Normal Campaign: Operation Cleansweep

Complete the Operation Cleansweep campaign on Normal difficulty or harder.

11.87%

Pyrotechnician

Kill 250 Swarm with the Flamer.

12.04%

Easy Campaign: Area 9800

Complete the Area 9800 campaign on Easy difficulty or harder.

12.36%

Easy Campaign: Operation Cleansweep

Complete the Operation Cleansweep campaign on Easy difficulty or harder.

12.68%

Damage Amped

Kill 15 Swarm with all four marines under the effects of a Damage Amp in a single mission.

16.80%

Ammo Technician

Deploy 10 ammo stashes that are used by other marines.

17.04%

Assault Specialist

Kill 250 Swarm with the Assault Rifle.

17.45%

Prototype Professional

Kill 250 Swarm with the Prototype Rifle.

17.45%

Autogun Expert

Kill 250 Swarm with the Autogun.

17.93%

Parasite Puncher

Kill a Swarm Parasite with a melee attack.