You’ll earn this trophy the first time you Stagger an enemy. When you meet various conditions in battle - usually targeting an enemy’s elemental weakness, dodging certain attacks, counterattacking, or just dealing enough damage - the enemy will become “Pressured”. At this point you’ll be able to increase their Stagger gauge faster than usual, something attacks like “Focused Thrust” and “Focused Strike” excel at. Once you fill an enemy’s Stagger gauge they’ll become Staggered. Using Punisher mode to counterattack Guard Dogs will go a long way towards Staggering them, and if that fails, Sweepers and the Scorpion Sentinel are all likely to be Staggered in Chapter 1. It’s inconceivable that you’ll somehow beat the game without Staggering some enemy at some point.