Dark Void
58 Achievements
15-19h
Speedster
Survivor Missions: Complete any Survivor Mission in under 35 minutes
1.7%
How to unlock the Speedster achievement in Dark Void - Definitive Guide
There are 10 waves in both missions so you must average under 3.5 minutes per wave. This is easier to do on the Battle of Ghen Crag and the trophy will unlock once you complete all 10 waves.
Once again, Battle of Ghen Crag is probably the better choice for this one. While it is not needed to get this achievement, it would be helpful to turn on the 'Time Press' modifier to help motivate you to go as fast as possible. Be aggressive but make sure to stay smart and try to flank around cover. Using the Reclaimer and Oppressor is a good combo, long range and high damage with the Reclaimer + basic gunfighting with the Oppressor. Just be quick moving from stage to stage and changing direction as enemies come from each corner.