Here is the full list of all 38 Thief trophies - there are 24 bronze, 8 silver, 5 gold and 1 platinum.
The True Master Thief
Discover all secret areas
Complete all collectible sets
Complete 25 optional Thieving Challenges
Use 40,000 gold
Score an epic 5,000,000 or more in a Challenge Map
Finish the game with a custom difficulty of 700 points or more
Finish the game without a single kill or knockout
Finish the game on Master difficulty
Reach the final chapter without using the focus ability
Finish 3 consecutive missions without taking damage
Find all the secret stashes in Moira
Steal all loot and collectibles in a single chapter
Complete all Basso Jobs in The City
Complete all Client Jobs in The City
Kill or knockout 10 people using the environment
Complete a collectible set
Finish Chapter Eight
Finish the game in 15 hours or more
Finish Chapter Seven
Pick 100 pockets in a single playthrough
Complete 10 optional Thieving Challenges
Finish Chapter Six
Pick a lock with masterful speed
Finish Chapter Five
Disarm ten trap mechanisms
Discover 15 secret areas
Shoot a bottle in mid-air with an arrow
Finish a single chapter without alerting anyone
Finish Chapter Four
Finish Chapter Three
Pick a pocket and a lock using the focus ability
Finish Chapter Two
Sweet sixteen. Snuff said.
Steal 5 collectibles
Finish Chapter One
Uncover Lyegrove's secret
Finish the Prologue