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