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