Here is the full list of all 20 Retro City Rampage DX achievements.
Beat Death Cam VHS without dying
Beat Super Stomp Shenanigans in Turbo Mode
Hit 25 pedestrians in a row with your car without stopping
Avoid the cops at maximum threat level for 1 minute on foot, without taking damage
Get gold medal scores in all sprees
Find all hidden loot bags, payphones and invisible walls
Knockdown three pedestrians with a single fling using the BioClaw
Collect all time machine parts
Hit 4 people with a single shotgun blast
Dethrone GLC's high score
Match all cards in a single round of the casino game at the Spades To Steal Casino
Reach a 99X chain multiplier
Play Free Roaming Mode as one of the guest stars
Knock someone off their bike to ricochet another off theirs
Kill 256 civilians within a single life
Drive 65,536 pixels
Get "sick" on "milk"
Blow up 8 vehicles in 8 seconds
Kill four green sewer dwellers
Raise your threat level by committing a crime that attracts police attention