X-Men: Destiny
50 Achievements
15-20h
PS3
Beginner's Luck
Complete your first Great combo.
83.8%
How to unlock the Beginner's Luck achievement in X-Men: Destiny - Definitive Guide
Kind of like the achievement's title, your likely to just stumble on this. I just started playing this game with Density Control power, and I had leveled it up to 2 which gives you a "clap" at the end of your string to damage/knockback enemies. The Purifiers often swarm, so just keep beating on a group, making sure to keep varying who your attacking, and this should come. I believe it requires 10 or so hits strung together.
A short video guide on how to get this achievement but like the previous post you should stumble upon its during game play.
See This can't be happening! for more information.