Here is the full list of all 40 Cathedral trophies - there are 20 bronze, 16 silver, 3 gold and 1 platinum.
Earn all other trophies
Kill Augr
Kill 50 blobs (of any kind)
Kill 100 blobs (of any kind)
Kill 150 blobs (of any kind)
Kill 50 skulls (of any kind)
Kill 100 skulls (of any kind)
Kill 150 skulls (of any kind)
Destroy an electric orb in Necromancer's den using the lantern
Die one hundred times
Kill the Necromancer
Find all map pieces
Return 20 books
Return 40 books
Return 60 books
Return 80 books
Find all charms
Have more than 10 000 gold stored in the bank
Buy the Emerald armor
Buy the Tourmaline armor
Buy the Onyx armor
Kill Salemacke
Kill Thalia
Kill Nidlong
Slay all gargoyles
Acquire all Ouroboros amulets
Acquire all health bottles
Find all ammo upgrades for the Magnus Apparatus
Find all ammo upgrades for the Flintlock
Find all hearts
Kill Oloc
Destroy the Conduit
Return 100 books
Find and activate all portals
Have more than 25 000 gold stored in the bank
Kill the blood knot
Find all armor augmentations
Kill Ardur
Have more than 50 000 gold stored in the bank
Complete the game without upgrading the armor