The Stagger Effect Pt. 1
|Use unique abilities on staggered enemies and charge the ATB gauge 10 times.||Chapter 3||First Strike Materia|
You'll pick this up in Chapter 3 and you'll find that this will be the one you'll have the most trouble completing. Essentially, you need to use a character's unique action to raise your ATB gauge. Early on, Tifa will be your best bet at doing this, using her Chi Combo (Rise and Fall, Omnistrike, Whirling Uppercut) however if you don't mind waiting, it's a lot easier to use Barret's Overcharge. If you're going the route of Tifa, use one of her Chi Combo abilities just before your ATB reaches a charge, this should give you the charge needed and count towards your goal.