Alien Swarm: Reactive Drop achievements

Complete the Jacob's Rest campaign on Normal difficulty or harder.

Kill 6 Swarm with a single Grenade.

Stun 6 Swarm with a single Stun Grenade.

Heal all 4 marines with a single Heal Beacon.

Cure an Infested marine.

Complete the Jacob's Rest campaign on Easy difficulty or harder.

Kill 5 Swarm with explosive barrels in a single mission.

Successfully perform 5 fast reloads in a row.

Kill 1,000 Swarm.

Destroy all Swarm Eggs in a mission without allowing any to hatch.

Kill 20 Swarm with melee attacks in a single mission.

Complete a mission with better than 90% accuracy.