Here is the full list of all 51 Knights Contract trophies - there are 40 bronze, 8 silver, 2 gold and 1 platinum.
Fully execute your Knights Contract
Defeat 200 enemies with Knight's Fury
Beat the game on Witchslayer
Acquire all Witchcraft
Acquire Spirit Cannon
Beat the game on Hexen Knight
Beat the game on Knight
Land 1,000 Finishers
Defeat 200 enemies with Witch's Embrace
Carry Gretchen around for a long time
Acquire all collection items
Acquire all equipment
Catch and defeat five enemies at once with Mag Mell's Rose
Beat the game on Squire
Beat the game on Page
Defeat your true enemy
Defeat Faust
Land 100 Perfect Finishers
Defeat 1,000 enemies
Damage both yourself and an enemy with Witchcraft 10 times
Defeat the witch Verderinde
Collect 100,000 souls
Defeat 50 enemies with the help of Minukelsus
Acquire the Scythe of Imperial Massacre
Defeat the witch Rapunzel
Repel an enemy's attack 10 times
Defeat the witch Trendula
Save Gretchen from enemy attack 50 times
Attain the highest possible combo rating
Pick up the same enemy five times
Bash the same enemy into a wall five times
Collect 100 Recovery Items
Force Faust to retreat
Land 100 Finishers
Defeat the witch Holda
Perform 10 counterattacks while taking enemy attacks
Revive 50 times
Acquire the Scythe of the Assassin Queen
Defeat the witch Trude
Perform a 30-hit combo
Upgrade a Witchcraft
Collect 10,000 souls
Use Witch's Embrace when no enemies are present
Damage both yourself and an enemy with Witchcraft
Defeat 100 enemies
Defeat the witch Straeggele
Land a Finisher
Save Gretchen from enemy attack
Experience your first revival
Acquire a collection item
Defeat an enemy