Here is the full list of all 29 Hitman: Contracts HD trophies - there are 12 bronze, 10 silver, 6 gold and 1 platinum.
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You drowned someone
A mission has been completed with precisely 47 kills
You retrieved the SPAS-12 from the florist
All Firearms collected and displayed in the training room
All Heavy Weapons collected and displayed in the training room
All Machine Guns collected and displayed in the training room
All Hand Guns collected and displayed in the training room
You picked up the Gold Desert Eagle Dual
You picked up the Minigun
All Sniper Rifles collected and displayed in the training room
Completed normal difficulty
Completed expert difficulty
Completed professional difficulty
You have found all Melee Weapons
All Assault Rifles collected and displayed in the training room
You killed the ghost
An innocent person has been killed
All Shotguns collected and displayed in the training room
5 Silent Assassin ratings awarded on the Normal difficulty
5 Silent Assassin ratings awarded on the Expert difficulty
5 Silent Assassin ratings awarded on the Professional difficulty
You used explosives on a victim
You poisoned a victim
A successful headshot has been performed
A successful kill has been performed
A Silent Assassin rating has been awarded
You completed the first mission on any level
You knocked a victim out