Here is the full list of all 14 Retro City Rampage trophies - there are 11 bronze, 2 silver and 1 gold.
Raise your threat level by committing a crime that attracts police attention
Reach a 99X chain multiplier
Get "sick" on "milk"
Play Free Roaming Mode as one of the guest stars
Hit 25 pedestrians in a row with your car without stopping
Kill 256 civilians within a single life
Hit 4 people with a single shotgun blast
Knock someone off their bike to ricochet another off theirs
Avoid the cops at maximum threat level for 1 minute on foot, without taking damage
Dethrone GLC's high score
Find all hidden loot bags, payphones and invisible walls
Beat Death Cam VHS without dying
Collect all of the time machine parts
Get gold medal scores in all sprees