Short Controlled Bursts is an achievement that requires you to complete a single mission with zero friendly fire on your part. It is a personal achievement, not a squad achievement, despite its ambiguous wording. You are required to have a weapon capable of dealing friendly fire damage to be able to earn this achievement.
- In order to qualify for the achievement, you need to use a weapon that can actually cause FF.
- Stay relatively far away from your team-mates.
- Volunteer to be "the rearguard", watching for (and killing) aliens coming up on your team from behind. That way, there shouldn't be any Marines between you and whatever you're shooting at.