Here is the full list of all 15 The St Christopher's School Lockdown achievements.
Found and worn all hats in the game.
Won all dolls in the game.
Went with Roger to find blackmail on Mortimer.
Went with Martin to find blackmail on Mortimer.
Finished the entire game.
Escaped the Teachers Lounge using the Mighty Puffer.
Escaped the Teachers Lounge using the gas detector.
Escaped the Teachers Lounge using the Fireplace.
Successfully captured the spider.
Disrupted Father Jeremy's show by giving Genesis canapes.
Answered all of Salvador Potestry's questions successfully.
Won the Extracurricular Evening Entertainment Extravaganza trivia contest.
Beat Roger in the trivia drinking game.
Hit the car with your trusty stick.
Read the journal, and all of it's horrific contents.