There are 26 Trophies that can be collected.

BRONZE

1st Mission Complete
You completed the first mission on any level

Silent Assassin
A Silent Assassin rating has been awarded

Normal Mode Complete
Completed normal difficulty

1st Kill
A successful kill has been performed

Killed the wrong guy
An innocent person has been killed

SILVER

5 Normal Silent Assassins
5 Silent Assassin ratings awarded on the Normal difficulty

5 Expert Silent Assassins
5 Silent Assassin ratings awarded on the Expert difficulty

Expert Mode Complete
Completed expert difficulty

All Melee Weapons collected
All Melee Weapons collected and displayed in Hideout

All Hand Guns collected
All Hand Guns collected and displayed in Hideout

All Machine Guns collected
All Machine Guns collected and displayed in Hideout

All Assault Rifles collected
ll Assault Rifles collected and displayed in Hideout

All Shotguns collected
All Shotguns collected and displayed in Hideout

All Sniper Rifles collected
All Sniper Rifles collected and displayed in Hideout

All Heavy Weapons collected
All Heavy Weapons collected and displayed in Hideout

Headshot
A successful headshot has been performed

GOLD

5 Professional Silent Assassins
5 Silent Assassin ratings awarded on the Professional difficulty

Professional Mode Complete
Completed professional difficulty

All Firearms collected
All Firearms collected and displayed in Hideout

47 kills in a mission
A mission has been completed with precisely 47 kills

PLATINUM

Perfect Assassin
Unlock all trophies

5 SECRET

SILVER

Samurai Gaijin
Obtain katana from a ninja

Humanist
Successfully used anaesthetic

Jack the Ripper
Kill using all three Knives: Scalpel, Kitchen and Combat Knife

Redrum
Kill using the fire axe

GOLD

Call the caddy
Kill 18 people using the golf club

http://www.ps3trophies.org/game/hitman-2-silent-assassin-hd/trophies/