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