This Achievement is for seeing all the mystic arts in the game. This includes all playable characters, their secret Mystic Arts and all enemy mystic arts. This is the only Missable Achievement in the game however it can be done across many play throughs so dont fret too much.' First we will go through all playable character arts.
Velvet
Lethal Pain - With 3 BG hold the C key or LT during a combo
Annihilating Crash - With 4 BG hold the C key or LT during a 8+ hit combo
Impulse Desire - With 5 BG hold the C key or LT while Nightmare Claw is active
*Third Mystic Art unlocked by defeating the boss unlocked by putting the purple orb in the monolith
Rokurou
Form 0: Sunder - With 3 BG hold the C key or LT during a combo
Rangetsu Heron - With 4 BG hold the C key or LT during a 8+ hit combo
Form 9: Final Judgement - With 5 BG hold the C key or LT during Vengeful Retribution
*Third Mystic Art unlocked by defeating the boss unlocked by putting the green orb in the monolith
**TIP** To complete Rokouro's Mystic Arts you must understand how his Break Souls work. Two of his Break Souls activate on their own. Vengeful Stance is activated by holding the break soul key or RT. If you are hit within 1 second of using Vengeful Stance, Vengeful Punishment will automatically activate and you will teleport behind an enemy and land an attack. Vengeful Scourge will also automatically activate if you continue a combo without getting hit right after activating Vengeful Punishment. Once Vengeful Scourge activates hold the break soul key or RT to activate Rokouro's last break Soul Vengeful Retribution where you will be able to activate the Mystic Art.
Magilou
Ascending Angel - With 3 BG hold the C key or LT during a combo
Good Grip - With 4 BG hold the C key or LT during a 8+ hit combo
The Host of Forty-Nine - With 5 BG hold the C key or LT while performing tetra Detonator
*Third Mystic Art unlocked by defeating the boss unlocked by putting the White orb in the monolith
Laphicet
Binding Order - With 3 BG hold the C key or LT during a combo
Chaos Bloom - With 4 BG hold the C key or LT during a 8+ hit combo
Indignation - With 5 BG hold the C key or LT while Soul Distortion is active during a combo
*Third Mystic Art unlocked by defeating the boss unlocked by putting the red orb in the monolith
Eizen
Perfect Mayhem - With 3 BG hold the C key or LT during a combo
Howling Dragon - With 4 BG hold the C key or LT during a 8+ hit combo
Venom Strike - With 5 BG hold the C key or LT during Tyrants Fete
*Third Mystic Art unlocked by defeating the boss unlocked by putting the yellow orb in the monolith
Eleanor
Spiral Hail - With 3 BG hold the C key or LT during a combo
Lostfon Drive - With 4 BG hold the C key or LT during a 8+ hit combo
Gungnir Twister - With 5 BG hold the C key or LT during Strike Drei
*Third Mystic Art unlocked by defeating the boss unlocked by putting the teal orb in the monolith
Dual Mystic Arts
Velvet\Laphicet - With 5 BG, one member active and the other in your reserves in your reserves use the Swap and Mystic Art Button\Keys at the same time
Rokurou\Eizen - With 5 BG, one member active and the other in your reserves use the Swap and Mystic Art Button\Keys at the same time
Magilou\Eleanor - With 5 BG, one member active and the other in your reserves use the Swap and Mystic Art Button\Keys at the same time
*Dual Mystic Arts are unlocked by defeating certain bosses in the Bonus Dungeon*
Enemy Mystic Arts
Artorius - First Encounter after prologue - Cant be missed
Shigure - You will fight Shigure after leaving the Vester tunnels he has to use the Mystic Arte in the battle.
Teresa - Baird Marsh
Oscar - Baird Marsh
Horned Demon - Baird Marsh
Shigure - Mount Killaraus: There are two variations of the Mystic Arte, one with Rokurou in the party and one with Rokurou in the reserves. See them both.
Melchior - Mount Killaraus:
Artorius - Last Dungeon
Innominat - Last Dungeon
Armatized Artorius - Last Dungeon
Phoenix - Titania: He has two Mystic Arts. One he will use in battle, one that has a chance to activate after defeat to revive himself.
Dark Turtlez - Katz Korner: He has two Mystic arts. One will be activated during the fight. The second activates upon using an item.
Zaveid - Gaiburk Ice Field: A Promise Made Side Quest.
Jude - Yseult: Striding Beyond the End Side Quest
Milla - Figahl Icecaps: Striding Beyond the End Side Quest
Jude&Milla Dual Mystic Art - Normin Island: Striding Beyond the End Side Quest(Upon killing one of them, you can see the remaining characters Mystic Art if you happened to miss one.)