Here is the full list of all 15 Slayer Shock achievements.
You finished Season 1.
You learned one complete skill track.
A slayer is born.
You defended yourself in the Intro.
You finished Season 2.
You finished Season 3.
You finished Season 4.
You finished a Legacy.
You learned two complete skill tracks.
You learned three complete skill tracks.
You mastered all four skill tracks.
You completed a stealth mission without being detected.
A Big Bad was dusted by a werewolf.
You finished a season in the last standing neighborhood.
You finished a season on episode 7.