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Critical Mastery (Combat, Critical)

Source PRPG Core Rulebook pg. 120
Your critical hits cause two additional effects.

Prerequisites: Critical Focus, any two critical feats, 14th-level fighter.

Benefit: When you score a critical hit, you can apply the effects of two critical feats in addition to the damage dealt.

Normal: You can only apply the effects of one critical feat to a given critical hit in addition to the damage dealt.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
When you confirm a critical hit, instead of applying the effects of two critical feats you possess, you can spend 2 stamina points to apply the effect of any one critical feat you don’t possess (but for which you qualify).

Mythic Critical Mastery

Source Mythic Adventures pg. 61
Your critical hits are versatile and devastating.

Prerequisites: Critical Focus (mythic), Critical Mastery.

Benefit: When using Critical Mastery, increase the number of critical feats you may apply by every 3 tiers that you possess.