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
Complete 50 challenges with a gold rating
Replay the final mission and defeat the boss under par
Replay any Mission and complete it under par
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)
Find all 20 secret sightseeing locations in Sunset City
Deface 40 billboards with graffiti
Find all 12 of Ainsley's drawings scribbled on city walls
Equip one piece of clothing from each Faction at the same time
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
Work with Buck and Same to create a new weapon
Weapons design is a tough business
Find Fiona and Lou, then help the escape by fixing Snackwrap
Ride a cargo container into the factory
Anybody can be a movie producer, because nobody knows what they do
Defeat the DL-sea monster
Protect the boat from bombs, mortars, and OD
Collect 250 fashion items
Light fires big enough to see from space
Smoking causes lung cancer, heart disease, and instant death
Build the 'Feel the Burn' weapon for a guy who is stir-crazy... or just crazy
Arrive at the Mooil Rig
Find Bryllcream... again
Chain together 100 traversal moves without stopping or touching the ground
Kill 100 enemies by flinging them into danger using the Springboard Trap
15,000 OD massacred
Destroy 25 Fizzco Blimps just because you can
Destroy 250 Overcharge XT vending machines
Beat the score of 600,000 on the Challenge 'Buck Stops Here'
Beat the score of 400,000 on the Challenge 'Buck National vs The Apocalypse'
Beat Insomniac QA's high score of 534,080 on the Challenge 'Buck's Revenge'
Watch the credits all the way through
You beat the final Fizzco corporate machine
Take back Sunset City for the misfit survivors
Beat the score of 500,000 on the Challenge 'Buck Strikes Back'
Upgrade the Overcharge vats at every fort
Loot 25 emergency supply drops
Eavesdrop on nine conversations by hacking into satellites
Kill 500 enemies with traps
Get to the bottom of Fizzco's corporate secrets
You forgot the mythical Excalamune
Destroy all 150 Fizzco security cameras
Collect all 150 Fizzie balloons
Collect all 150 scraps of toilet paper
Collect all 150 Overcharge hologram signs
Collect all 150 shoes hanging from wires
Collect all 40 Smartphones
Complete a quest from every Faction
Reach Level 99 in Ignatius' epic RPG campaign
Melee 50 enemies while grinding
Save Sunset City from Fizzco's second-most powerful robot
Upgrade one of your guns to Level 5
5,000 OD Massacred
Complete 30 challenges with at least a silver rating
That was a lot of pigeons
Clear Fargarthia of a hidden evil
Become an honorary Troop Member by finding Bryllcream and defeating Norton
Unlock at least one Rank 4 Overdrive
Collect 20 Amps from Floyd
Liberate all the comic books for the comic book collector
Spend at least 25,000 Overcharge
You killed a balloon
Survive the glider crash and look for another way out of the city
Complete an optional Night Defense without losing any of your overcharge
Complete 10 challenges with at least a bronze rating
Burn, Shock, Freeze, or Enrage 1,000 enemies
Equip 5 Amps on your character at the same time
Kill 500 enemies while at Style Level 3
Become a reality TV star
Kill 100 enemies while bouncing or while in the air
Unlock an Overdrive
Earn a Badge
Survive one night at your Fort
Kill 100 enemies wile grinding
You earned an achievement
Survive Horror Night