Here is the full list of all 80 Sunset Overdrive achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Upgrade 20 guns to Level 5
Upgrade 10 guns to Level 5
15,000 OD massacred
Find all 12 of Ainsley's drawings scribbled on city walls
Replay the Floating Garbage mission and beat the score of 50,000
Ha, ha! I can't believe you fell for that! (Acquire Worst Job in the Kingdom)
Work with Buck and Same to create a new weapon
Weapons design is a tough business
Defeat Brandon. Like, for real
Reroute the power inside the factory in the weirdest way possible
Put on a robot costume and collect the kill codes
Find Fiona and Lou, then help the escape by fixing Snackwrap
Ride a cargo container into the factory
Replay any Mission and complete it under par
Replay the final mission and defeat the boss under par
Anybody can be a movie producer, because nobody knows what they do
Build the 'Feel the Burn' weapon for a guy who is stir-crazy... or just crazy
Defeat the DL-sea monster
Protect the boat from bombs, mortars, and OD
Light fires big enough to see from space
Smoking causes lung cancer, heart disease, and instant death
Arrive at the Mooil Rig
Find Bryllcream... again
Eavesdrop on nine conversations by hacking into satellites
Kill 100 enemies by flinging them into danger using the Springboard Trap
Destroy 250 Overcharge XT vending machines
Complete 50 challenges with a gold rating
Beat the score of 600,000 on the Challenge 'Buck Stops Here'
Beat Insomniac QA's high score of 534,080 on the Challenge 'Buck's Revenge'
Beat the score of 500,000 on the Challenge 'Buck Strikes Back'
Beat the score of 400,000 on the Challenge 'Buck National vs The Apocalypse'
Collect 250 fashion items
Collect all 40 Smartphones
Take back Sunset City for the misfit survivors
Collect all 150 Fizzie balloons
Collect all 150 Overcharge hologram signs
Find all 20 secret sightseeing locations in Sunset City
Chain together 100 traversal moves without stopping or touching the ground
Collect all 150 shoes hanging from wires
Deface 40 billboards with graffiti
Collect all 150 scraps of toilet paper
Equip one piece of clothing from each Faction at the same time
Watch the credits all the way through
You beat the final Fizzco corporate machine
Collect 20 Amps from Floyd
Upgrade the Overcharge vats at every fort
Destroy all 150 Fizzco security cameras
Get to the bottom of Fizzco's corporate secrets
Upgrade one of your guns to Level 5
Reach Level 99 in Ignatius' epic RPG campaign
Complete an optional Night Defense without losing any of your overcharge
Kill 500 enemies with traps
Complete 30 challenges with at least a silver rating
5,000 OD Massacred
You forgot the mythical Excalamune
Complete a quest from every Faction
Save Sunset City from Fizzco's second-most powerful robot
Liberate all the comic books for the comic book collector
Destroy 25 Fizzco Blimps just because you can
Loot 25 emergency supply drops
Complete 10 challenges with at least a bronze rating
Kill 500 enemies while at Style Level 3
Unlock at least one Rank 4 Overdrive
That was a lot of pigeons
Clear Fargarthia of a hidden evil
Become an honorary Troop Member by finding Bryllcream and defeating Norton
Kill 100 enemies while bouncing or while in the air
Burn, Shock, Freeze, or Enrage 1,000 enemies
Melee 50 enemies while grinding
Spend at least 25,000 Overcharge
You killed a balloon
Survive the glider crash and look for another way out of the city
Equip 5 Amps on your character at the same time
Become a reality TV star
Unlock an Overdrive
Earn a Badge
Survive one night at your Fort
Kill 100 enemies wile grinding
You earned an achievement
Survive Horror Night