Full list of all 50 Crackdown achievements worth 1,250 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 43 achievements worth 900 Gamerscore, and there are 2 DLC packs containing 7 achievements worth 350 Gamerscore.
Successfully complete all 12 Rooftop Races
Wreak havoc in 60-second increments
Drive through all of the unique Stunt Markers
Successfully complete all 14 Road Races
Use explosives to keep a body up in the air for 10 seconds
Successfully execute five car stunts - front & back flips, barrel rolls, a long jump
Use explosives to keep a car up in the air for seven seconds
Execute a 6-second jump in a vehicle
Execute six car stunts in 60 seconds
Execute two forward flips in a single jump in a moving vehicle
Achieve a height of 115 feet or more in a vehicle
Commandeer 100 gang-controlled vehicles
Accelerate and slide your way to a 4-star Driving rating
Kill 15 gang members using the Observatory Globe
Mow down and massacre 175 gang members while driving
Throw any object (other than a grenade) 205 feet or more
Blow up 100 explosive objects in 60 seconds
Partner up and complete every mission in Co-op mode
Bomb your way to a 4-star Explosives rating
Wipe the city clean by taking out all members of all three gangs
Assassinate Shai-Gen - kill all Shai-Gen gang members
Show your explosive personality - kill 500 gang members using explosives
Locate all Shai-Gen dossier targets
Run & jump your way to a 4-star Agility rating
Hit your target every time to achieve a 4-star Firearms rating
Unlock all Supply Points
Shoot and kill 5 gang members in a single jump (while airborne)
Kill 200 gang members without dying yourself
Jump from the top of the Agency Tower and land in the water below
Make your way to the top of the Agency Tower
Eviscerate the Volk - take out all Volk gang members
Locate all Volk dossier targets
Punch, jab, kick, and throw your way to a 4-star Strength rating
Fire away - shoot and kill 500 gang members using firearms
Kill 150 gang members with your bare hands (or thrown objects)
Murder Los Muertos - kill all Los Muertos gang members
Locate all Los Muertos dossier targets
Double your fun - complete your first mission in Co-op mode
Unlock your first Supply Point
Eliminate the first of 21 gang bosses
Earn 4-star ratings in all five skill areas and then max out your Skills Status meters
Collect 300 Hidden Orbs
Collect 500 Agility Orbs
Impound all flagged vehicles and store them in the Agency Garage
Complete all Time Trial missions at the Psychotic difficulty level
Win every Street Race using all available vehicles
Win every Street Race using any vehicle(s)
Execute 3 flips of any type in a single jump in any vehicle
Use the Harpoon gun to attach 5 gang member corpses to a single vehicle
Complete any Stockpile mini-game in Co-op mode in fewer than 2 minutes and 30 seconds