All Firearms collected and displayed in the training room

You have found all Melee Weapons

All Sniper Rifles collected and displayed in the training room

All Heavy Weapons collected and displayed in the training room

You picked up the Gold Desert Eagle Dual

Completed normal difficulty

Completed professional difficulty

5 Silent Assassin ratings awarded on the Normal difficulty

5 Silent Assassin ratings awarded on the Professional difficulty

You poisoned a victim

A successful headshot has been performed

A successful kill has been performed

You completed the first mission on any level