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