Here is the full list of all 22 Churchgoers achievements.
Aquire your first prayer.
Start your adventure.
Aquire your second prayer.
Complete Meadow of Awakening.
Aquire your third prayer.
Aquire your fourth prayer.
Complete the School of the West.
Complete the game.
Get two school sigils before gaining your third prayer.
Never get spotted.
Play all of the students' games.
Play the game about the red tree.
Play the game about the vaporwave spaceship.
Play the game about following the light.
Play the game about the gun goons.
Play the game about a kigurumi-wearing teen.
Play the game about an FPS character stuck in an MMORPG.
Play the game about rock, paper, scissors.
Get the Lava sigil.
Get the Featherfall sigil.
Get the Warrior sigil.
Don't get a single question wrong from the Demon's questions.