Campaigns are storylines consisting of several missions. Official campaigns in Steam releases of Alien Swarm have achievements associated with completing every mission on each difficulty level, speedrunning each mission, and completing the entire campaign in one sitting without any marines dying.

Official Campaigns

Alien Swarm

Alien Swarm (2010, Valve) was released with a single official campaign. This campaign is also included in Alien Swarm: Reactive Drop.

• Jacob’s Rest

Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop made several community campaigns official.

• Area 9800
• Operation Cleansweep
• Research 7
• Tears for Tarnor (originally purchased by Valve)
• Tilarus-5
• Lana’s Escape (originally purchased by Valve)
• Paranoia
• Nam Humanum (added 20th April 2022)
• BioGen Corporation (added 20th April 2022)
• Accident 32 (added 20th April 2023)
• Reduction (added 1st November 2023)

Alien Swarm 2K4

Alien Swarm was originally a total conversion mod of Unreal Tournament 2004, made by Black Cat Games as part of the Make Something Unreal competition.

• Sigma Campaign
• Ortega Campaign
• Upsilon Campaign (support added 10th September 2004)
• Phalanx Campaign (announced 28th June 2005)
• Telic Campaign (support added 16th December 2005)
• Escape from Rhea (announced 13th February 2007)