There are 47 Trophies that can be collected.

BRONZE

The Russian Hare
47 precision headshots using a sniper rifle

A Taste for the Game
Complete 10 challenges

It's All in the Wrist
Achieve a lethal throw kill

Damage Control
Contain a situation gone bad

Self-improvement
Buy an upgrade

First Contract
Complete the Create Contract Tutorial

Blood Money
Complete the Play Contract Tutorial

True Potential
Unlock a technique

Inconspicuous
Remain undetected in a whole checkpoint

Whoops
Achieve your first accident kill

Rocksteady
Execute a point shooting with 3 kills

Under Wraps
Hide a body

Sandman
Subdue a person

SILVER

Reach for the Stars
Complete 50 challenges

Jack of All Trades
Collect all play styles

Information is Power
Collect all evidence

Thumbs Up
Like a contract

Set for Life
Earn 1 million contract dollars

Partners in Crime
Play a contract created by a friend

Competitive Spirit
Create a contract competition

Contender
Participate in a contract competition

One With the Shadows
Escape attention from enemies

Silent Assassin
Achieve the rating: Silent Assassin

One of the Guys
Blend in successfully

GOLD

Grand Master
Complete 100 challenges

Absolution
Complete Hitman: Absolution™ on any professional difficulty

PLATINUM

Top of Your Game
Collect all trophies

20 SECRET

http://www.ps3trophies.org/game/hitman-absolution/trophies/