Here is the full list of all 28 The Padre achievements.
Kill some spiders in the name of the Lord
Use your brain to win over an enemy
Bring the first zombie back to the grave
Banish the hall monster
Visit all the mirror worlds
Two headshots in a row
Empty the flask of angel tears
Drink from the tainted well five times
Solve the carpet puzzle
Help out the ghost detective
Trap the skull dog
Find all the scrolls of Ramirez
Find a secret passage
Banish the horror back to its realm
Open the way with music
Clear up the cellar prison cells
Remove the ghost threat from the library
Finish the animated Armor
Get rid of the Dumpling
Clean up the dining room
Reach the roof
Enter the first mirror world
Meet Benedictus for the first time
Find a hidden book
Solve the clock puzzle
Kill five enemies with a melee weapon
Try an epic board game
Solve the vase puzzle