Here is the full list of all 30 Judge Dredd: Countdown Sector 106 achievements.
Find all the perp records and data
Find all the illustrations
Roll two ones in a single roll
Arrest 5000 perps in one go
Roll two sixes in a single roll
Accidently knock down a group of old folks
Abseil down a building and through a window
Arrest a perp for breaking health regs
Find all the mysterious VoD devices
Visit all active locations in Sector 106
Kill or arrest all perps connected to data from the briefing room
Take down a gambling den
Find the ultimate ending in Hardcore mode
Kill three perps in one move
Take down a Robot
Kill two unusual creatures
Be responsible for the destruction of a pot-plant
Use explosive rounds
Use your Bootknife
Enter Harridges from the front and back
Use ricochet rounds
Ride a powerboard
Find the ultimate ending in any mode
Find all the blueprints
Successfully pull off a Lawmaster Kick
Take down a cannibal with a large appetite
Use armour piercing rounds
Get to know all of Sector House 106
Find all the Vitality bonuses
Achieve a Lawgiver Skill of 10 or above