There are a total of 18 souvenir, one per level.
► All the Souvenir Locations:
Second Chance (0:00)
Sudden Impact (0:30)
Road Rage (0:55)
Lab Rat (1:16)
Gate Keepers (1:36)
Dead Man Walking (1:57)
Seat of Power (2:19)
Dark Heart (2:53)
Semper Fi or Die (3:21)
Corporate Collapse (4:07)
Train to Catch (5:34)
Unsafe Haven (4:56)
Terminus (5:15)
Power Out (5:30)
Eye of the Storm (5:52)
Masks Off (6:14)
Out of the Ashes (6:28)
A Walk in the Park (6:43)