Alien Swarm: Reactive Drop achievements

11.13%

Short Controlled Bursts

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

11.13%

Stay Frosty

Freeze 6 Swarm with a single Freeze Grenade.

11.45%

Normal Campaign: Operation Cleansweep

Complete the Operation Cleansweep campaign on Normal difficulty or harder.

11.86%

Pyrotechnician

Kill 250 Swarm with the Flamer.

12.02%

Easy Campaign: Area 9800

Complete the Area 9800 campaign on Easy difficulty or harder.

12.35%

Easy Campaign: Operation Cleansweep

Complete the Operation Cleansweep campaign on Easy difficulty or harder.

12.75%

Damage Amped

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

16.82%

Ammo Technician

Deploy 10 ammo stashes that are used by other marines.

17.06%

Assault Specialist

Kill 250 Swarm with the Assault Rifle.

17.38%

Autogun Expert

Kill 250 Swarm with the Autogun.

17.55%

Prototype Professional

Kill 250 Swarm with the Prototype Rifle.

18.03%

Parasite Puncher

Kill a Swarm Parasite with a melee attack.