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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Completed expert difficulty
Completed professional difficulty
5 Silent Assassin ratings awarded on the Expert difficulty
5 Silent Assassin ratings awarded on the Professional difficulty
All Firearms collected and displayed in the training room
All Sniper Rifles collected and displayed in the training room
All Machine Guns collected and displayed in the training room
You have found all Melee Weapons
All Heavy Weapons collected and displayed in the training room
All Assault Rifles collected and displayed in the training room
All Hand Guns collected and displayed in the training room
You drowned someone
All Shotguns collected and displayed in the training room
5 Silent Assassin ratings awarded on the Normal difficulty
Completed normal difficulty
You picked up the Gold Desert Eagle Dual
You picked up the Minigun
You retrieved the SPAS-12 from the florist
You killed the ghost
A Silent Assassin rating has been awarded
You used explosives on a victim
You poisoned a victim
You knocked a victim out
A mission has been completed with precisely 47 kills
You completed the first mission on any level
A successful headshot has been performed
An innocent person has been killed
A successful kill has been performed