https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3263202083
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3176959124
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3168291206

Are you about to play GTA III after several years, or maybe on your way to do your first playthrough and/or want to experience every little thing this game has to offer?

This walkthrough will let you efficiently finish Grand Theft Auto: III – The Definitive Edition while unlocking all achievements and getting 100% completion.
Missions, sidemissions and other tasks are in order of when they are unlocked, or in the order that makes the most sense.

Some tasks in the list are not necessary for either 100% or an achievement.

25 hours

Create a new note for Grand Theft Auto: III – The Definitive Edition and copy the checklist section you want to work on from this guide into it.
That way you can use the steam overlay to check off any task that you've done.
Notes on steam can be a bit buggy if they are too long, keep each section as its own note.

Bold = 100% task
Underlined = Achievement task
Normal = Optional task
Italic = Comments

https://mapgenie.io/ - Map Genie - Great for finding collectibles, stunt jumps, missions and/or all other kind of things.
https://gtasnp.com/ - GTASnP - Online tool for uploading your save files and being able to check your progress.

• Multiple gangs around Liberty City become hostile to the player after some story missions, this makes completing certain sidemissions, vehicle missions and rampages extremely difficult.
• A couple story missions from Luigi and Joey can be permanently disabled by completing Salvatore's mission 'Last Requests', thus preventing your save file from achieving 100% completion.
• There are 5 missable achievements in certain story missions.
• The phone mission 'Kingdom Come' must be completed before the last story mission 'The Exchange' to prevent 100% from being unachievable.

Therefore, I highly recommend following the guide step by step, or at least be wary of the effects of certain missions.
There are notes during the checklist that will warn you before continuing on.

[ ] Intro: Give Me Liberty
[ ] Paramedic - Level 12
  Achievement: Playing Doctor ⁽ˢᵗᵉᵃᵐ⁾
  Unlocks Infinite Sprint
[ ] Taxi - 100 fares in total
  Achievement: Where To? ⁽ˢᵗᵉᵃᵐ⁾
  Unlocks the Borgnine Cabbie
[ ] Vigilante - Kill 20 criminals in Portland
  Unlocks +2 police bribes at safehouses
[ ] Achievement: Going Rogue ⁽ˢᵗᵉᵃᵐ⁾
  Kill 15 criminals in a row in Vigilante
[ ] Firefighter - Extinguish 20 fires in Portland
[ ] Achievement: Splish Splash ⁽ˢᵗᵉᵃᵐ⁾
  Extinguish 15 fires in a row in Firefighter
[ ] Achievement: Relief Pitcher ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Extinguish 20 fires in a row in Firefighter
[ ] 31 Hidden Packages in Portland
  One additional one not accessible without boat, will be accounted for later
  Another additional one in the subway not accessible until Staunton Island, will be accounted for later
[ ] 8 Unique Stunt Jumps in Portland
[ ] Achievement: Wreckless Driving ⁽ˢᵗᵉᵃᵐ⁾
  Perform a perfect insane stunt
  Should unlock while doing unique stunt jumps
[ ] 6 Rampages in Portland
[ ] Achievement: Disposing of the Evidence ⁽ˢᵗᵉᵃᵐ⁾
  Crush a car at the junkyard
[ ] Achievement: Recycler ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Crush 25 cars at the junkyard
[ ] Import/Export - Portland
 [ ] Blista
   In Portland, can only be found parked at Capital Autos (Next to Eightballs Autoyard)
 [ ] Bobcat
 [ ] Bus
   Driven around Chinatown, if you see it, drop everything you're doing and get it
 [ ] Coach
 [ ] Dodo
   Parked in Francis International Airport (Wait until Shoreside Vale is unlocked)
 [ ] Flatbed
   Driven around Chinatown, if you see it, drop everything you're doing and get it
 [ ] Linerunner
 [ ] Moonbeam
 [ ] Mr. Whoopee
   Can be found around Portland, if you see it, drop everything you're doing and get it
 [ ] Mule
 [ ] Patriot
 [ ] Pony
 [ ] Rumpo
 [ ] Securicar
   Driven around Chinatown, if you see it, drop everything you're doing and get it
 [ ] Trashmaster
   Driven around Chinatown, if you see it, drop everything you're doing and get it
 [ ] Yankee
   Parked right next to the emergency vehicle crane behind the Import/Export garage
[ ] L: Luigi's Girls
  Achievement: First Day on the Job ⁽ˢᵗᵉᵃᵐ⁾
[ ] Off-Road: Patriot Playground
[ ] RC Toyz: Diablo Destruction
[ ] RC Toyz: Mafia Massacre
[ ] L: Don't Spank Ma Bítch Up
[ ] L: Drive Misty For Me
[ ] L: Pump-Action Pimp
!!!NOTE!!! Next mission contains a missable achievement!
[ ] L: The Fuzz Ball
 [ ] Achievement: Got This Figured Out ⁽ˢᵗᵉᵃᵐ⁾
   Use a Coach to pick up and deliver all 8 girls at once
   Get the Coach before starting the mission
[ ] Payphone Missions: Marty Chonks
  Available: 9am - 7pm
 [ ] The Crook
 [ ] The Thieves
 [ ] The Wife
 [ ] Her Lover
!!!NOTE!!! Next mission contains a missable achievement!
[ ] J: Mike Lips Last Lunch
 [ ] Achievement: Without a Scratch ⁽ˢᵗᵉᵃᵐ⁾
   Return Mike Lips' car without a scratch
!!!NOTE!!! Next mission contains a missable achievement!
[ ] J: Farewell 'Chunky' Lee Chong
 [ ] Achievement: Planned Ahead ⁽ˢᵗᵉᵃᵐ⁾
   Take out Lee Chong with a car rigged with a bomb
   Without being noticed, steal one of Lee Chong's two Perennials, parked at the south and west entrance to Chinatown. Rig the vehicle with a car bomb from Eightballs Autoyard and then park and arm the bomb in the same spot you stole it from. Run around the corner to the other entrance to scare Lee Chong towards the car that is rigged to explode.
[ ] J: Van Heist
[ ] Deliver 10 Securicars to the lockup at Portland Harbor
[ ] J: Cipriani's Chauffeur
  Achievement: Got Any Stories, Old Man? ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
[ ] J: Dead Skunk In The Trunk
[ ] J: The Getaway
[ ] Payphone Missions (Blue): El Burro
 [ ] Turismo (Repeatable)
  [ ] Achievement: By a Mile ⁽ˢᵗᵉᵃᵐ⁾
    Finish the race in 180 seconds
    Even though this mission will be repeatable, it will basically be impossible once The Leone Family Mafia is hostile. Make sure to complete this achievement before moving on to Staunton Island!
 [ ] I Scream, You Scream
 [ ] Trial By Fire
   The Triads become hostile after this mission
 [ ] Big'n'Veiny
[ ] T: Taking Out The Laundry
[ ] T: The Pick-Up
  The Triads become hostile after this mission
[ ] T: Salvatore's Called a Meeting
[ ] S: Chaperone
!!!NOTE!!! Next mission contains a missable achievement!
[ ] T: Triads and Tribulations
 [ ] Achievement: Mob Boss ⁽ˢᵗᵉᵃᵐ⁾
   Keep both mafia members alive during the mission
[ ] T: Blow Fish
!!!NOTE!!! Next mission contains a missable achievement!
[ ] S: Cutting The Grass
 [ ] Achievement: Fare Game ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
   Pick up Curly Bob in a Taxi
   Use a Taxi/Cabbie/Borgnine and wait behind the other Taxi just outside the entrance of Luigi's Club to pick up Curly Bob
[ ] S: Bomb Da Base: Act I
[ ] 8: Bomb Da Base: Act II
!!!NOTE!!! Complete all of Luigi's and Joey's mission before next mission!
[ ] S: Last Requests
  Achievement: A Marked Man ⁽ˢᵗᵉᵃᵐ⁾
  Unlocks Staunton Island
  Unlocks five-star wanted level

[ ] Vigilante - Kill 20 criminals in Staunton Island
  Unlocks +2 police bribes at safehouses
[ ] Firefighter - Extinguish 20 fires in Staunton Island
[ ] 35 Hidden Packages in Staunton Island
[ ] 1 Hidden Package on a rock south of Portland
[ ] 1 Hidden Package in the subway in Portland
[ ] 4 Unique Stunt Jumps in Staunton Island
[ ] 7 Rampages in Staunton Island
[ ] Achievement: Instigator ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Complete 10 rampages
[ ] Off-Road: Multistorey Mayhem
[ ] Off-Road: A Ride in the Park
[ ] RC Toyz: Casino Calamity
[ ] Achievement: Come Out to Play-y-y-y ⁽ˢᵗᵉᵃᵐ⁾
  Kill 25 gang members with melee weapons/fists
  The Diablos are a good choice for this achievement. Head to El Burro's Payphone (Blue) with a baseball bat and fight
[ ] Achievement: Street Sweeper ⁽ˢᵗᵉᵃᵐ⁾
  Kill 100 gang members
[ ] Achievement: Liberty City Minute ⁽ˢᵗᵉᵃᵐ⁾
  Survive for 1 minute with less than 10 hp
[ ] Achievement: Am Walkin' Here ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Die from being run over
[ ] A: Sayonara Salvatore
  The Leone Family Mafia become hostile after this mission
[ ] A: Under Surveillance
[ ] A: Paparazzi Purge
[ ] A: Payday For Ray
[ ] A: Two-Faced Tanner
[ ] Payphone Missions (Green): King Courtney
 [ ] Bling-bling Scramble (Repeatable)
 [ ] Uzi Rider
   The Diablos become hostile after this mission
 [ ] Gangcar Round-up
 [ ] Kingdom Come
   Achievement: A Gift from the King ⁽ˢᵗᵉᵃᵐ⁾
   The Yardies become hostile after this mission
[ ] K: Kanbu Bust-Out
[ ] K: Grand Theft Auto
[ ] K: Deal Steal
[ ] K: Shima
[ ] K: Smack Down
[ ] R: Silence The Sneak
[ ] R: Arms Shortage
[ ] Achievement: Hunting Season ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Destroy five helicopters
  Helicopters spawn during 3-star wanted level
[ ] R: Evidence Dash
[ ] R: Gone Fishing
[ ] R: Plaster Blaster
[ ] Achievement: Full Artillery ⁽ˢᵗᵉᵃᵐ⁾
  Use every weapon in the game
  Fist, Baseball Bat, Pistol, Uzi, Shotgun, AK47, M16, Sniper Rifle, Rocket Launcher, Flamethrower, Grenade, Molotov Cocktail, Detonator
[ ] D: Liberator
[ ] D: Waka-Gashira Wipeout!
[ ] D: A Drop in The Ocean
  Achievement: Offshore Delivery ⁽ˢᵗᵉᵃᵐ⁾
  Unlocks Shoreside Vale
  Unlocks six-star wanted level
[ ] Import/Export - Emergency vehicles
 [ ] Ambulance
 [ ] Barracks OL
   Parked at Phil's Army Surplus
 [ ] Enforcer
   Backlot of Staunton Island police headquarters or during four-star wanted level
 [ ] FBI Car
   Spawns only during five-star wanted level
 [ ] Fire Truck
 [ ] Police Car
 [ ] Rhino
   Spawns during six-star wanted level or take the Rhino parked at Phil's Army Surplus after last story mission 'The Exchange'
[ ] Achievement: Pest Control ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Deliver all emergency vehicles to the crane at Portland Dock

[ ] Vigilante - Kill 20 criminals in Shoreside Vale
  Unlocks +2 police bribes at safehouses
[ ] Achievement: Escape Artist ⁽ˢᵗᵉᵃᵐ⁾
  Use 20 police bribes
[ ] Firefighter - Extinguish 20 fires in Shoreside Vale
  Unlocks Flamethrower at Safehouses if you've also done 20 in Portland and Staunton Island
[ ] Achievement: Furious First Responder ⁽ˢᵗᵉᵃᵐ⁾
  Complete Paramedic, Firefighter and Vigilante
[ ] 32 Hidden Packages in Shoreside Vale
[ ] Achievement: Liberty City Secrets ⁽ˢᵗᵉᵃᵐ⁾
  Find all 100 hidden packages
[ ] 8 Unique Stunt Jumps in Shoreside Vale
[ ] Achievement: Wheels Up ⁽ˢᵗᵉᵃᵐ⁾
  Complete all 20 unique stunt jumps
[ ] 7 Rampages in Shoreside Vale
[ ] Achievement: Blood in the Street ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Complete all 20 rampages
[ ] Off-Road: Gripped!
[ ] RC Toyz: Rumpo Rampage
[ ] Achievement: Man Toyz ⁽ˢᵗᵉᵃᵐ⁾
  Complete all 4 RC Toyz missions
[ ] Import/Export - Shoreside Vale
  All vehicles except the BF Injection can be found near the Import/Export garage
 [ ] Banshee
 [ ] BF Injection
   Parked near El Burro's Payphone (Blue) between 6pm - 11:59 pm after 'Sayonara Salvatore'
 [ ] Cabbie
 [ ] Cheetah
 [ ] Esperanto
 [ ] Idaho
 [ ] Infernus
 [ ] Kuruma
 [ ] Landstalker
 [ ] Manana
 [ ] Perennial
 [ ] Sentinel
 [ ] Stallion
 [ ] Stinger
 [ ] Stretch
 [ ] Taxi
[ ] Achievement: Play Fetch ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Complete the Portland & Shoreside Vale Import/Export lists
[ ] Payphone Missions (Red): D-Ice
 [ ] Uzi Money
 [ ] Toyminator
 [ ] Rigged To Blow (Repeatable)
 [ ] Bullion Run
 [ ] Rumble
[ ] Achievement: Talks a Lot ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Complete all payphone missions
[ ] D: Grand Theft Aero
[ ] D: Escort Service
[ ] D: Decoy
[ ] D: Love's Disappearance
[ ] R: Marked Man
  Save Patriot (Bulletproof)
[ ] A: Bait
[ ] A: Espresso-2-Go!
[ ] A: S.A.M.
[ ] ↳: Ransom
[ ] Achievement: Chasing Paper ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Amass a fortune of $500,000
  Should be unlocked by this point, but is anyway required to unlock last mission
!!!NOTE!!! Complete Staunton Island Payphone mission 'Kingdom Come' before next mission!
[ ] C: The Exchange
  Achievement: Not So Fast ⁽ˢᵗᵉᵃᵐ⁾
[ ] Achievement: Is That All You've Got? ⁽ˢᵗᵉᵃᵐ⁾
  Reach 100% completion
  Unlocks after last mission if you've followed and done all 100% tasks prior to last mission
[ ] Achievement: Dirty Money ⁽ˢᵗᵉᵃᵐ⁾
  Amass a fortune of $1,000,000
  Should be unlocked by this point, if not, achieve a good Taxi streak
[ ] Achievement: Right-hand Man ⁽ˢᵗᵉᵃᵐ⁾
  Earn a criminal rating of 2500
  Should definitely be unlocked by this point, if not, cause mayhem
[ ] Achievement: King of Liberty City ⁽ˢᵗᵉᵃᵐ⁾
  Unlock all (Steam) achievements
[ ] Achievement: Repeat Offender ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Get busted 20 times
[ ] Achievement: Like a Boss ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Earn a criminal rating of 5000
  You will get this while trying for Cheaters Do Prosper! achievement
[ ] Achievement: Cheaters Do Prosper! ⁽ˢᵒᶜⁱᵃˡᶜˡᵘᵇ⁾
  Blow up 2000 cars
  This achievement is a grind, get a Rhino and cause mayhem on the streets. You can see your progress in stats

Congratulations, you won!

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https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3263202083
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3176959124
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3168291206