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