Alien Swarm: Reactive Drop achievements

Complete a mission on Normal difficulty or harder without any marines dying.

Roll under a Swarm Ranger projectile.

Deliver the finishing blow to a Swarm Shieldbug.

Kill 25 drones without friendly fire. Four marines must be present in the mission.

Seal a door with the welder.

Guard the squad's tech so that he takes no damage during the hack.

Kill a Swarm Boomer before it inflates.

Successfully perform a fast reload.

Finish a mission without the tech getting killed.