successfully completing a mission in Alien Swarm on or before 2013-08-26 Valhavoc, 2013-08-26 23:30:07 UTC
successfully completing a mission in Alien Swarm on or before 2013-08-26
successfully completing a mission in Alien Swarm on or before 2013-08-28 Valhavoc, 2013-08-28 23:30:08 UTC
successfully completing a mission in Alien Swarm on or before 2013-08-28