Here is the complete list of all achievements in-game and how to easily acquire them.
Title: All's Fare in Love and War
Description: Purchase Downtown Cab Co. and complete a private fare.
Remarks: Buy Downtown Cab Co. for $200, answer the private fare call when it pops up, then drive away.
Title: Career Criminal
Description: Attain 100% Game Completion.
Remarks: Finish 20 Strangers and Freaks Missions, 14 Random Events, 65 main missions, 42 hobbies or pastimes, and 16 Miscellaneous Tasks.
Title: Close Shave
Description: Complete all Under the Bridge and Knife Flight challenges.
Remarks: Pull up the internet browser on the in-game phone, visit the website "www.junkenergydrink.com", choose "YES", then select "Adrenaline Junkies" to reveal all the locations for this achievement.
Title: From Beyond the Stars
Description: Collect and return all spaceship parts.
Remarks: Follow the Spaceship Parts Guide for this achievement.
Title: A Lot of Cheddar
Description: Spend a total of $200 million across all three characters.
Remarks: Complete heists, buy and sell properties and stocks, follow the MONEY EARNING TECHNIQUES Guide.
Title: A Mystery, Solved
Description: Solve the mystery of Leonora Johnson.
Remarks: Complete the Letter Scraps side quests.
Title: Above the Law
Description: GTA Online – Reach Rank 100.
Remarks: Joining an online crew earns more experience points quicker.
Title: Altruist Acolyte
Description: Deliver an unsuspecting victim to the Altruist Cult.
Remarks: Use Trevor, check the Extra Scenarios guide for the characters you can bring to the Altruits.
Title: American Dream
Description: GTA Online – Own an Apartment, Garage and an Insured Vehicle.
Remarks: Joining an online crew missions earns more cash quicker.
Title: Full Refund
Description: GTA Online – Kill the thief that mugged you.
Remarks: Follow the description as is.
Title: Kifflom!
Description: Complete your path to enlightenment… or not.
Remarks: Finish the Epsilon Missions for this achievement.
Title: Los Santos Customs
Description: Fully mod a vehicle.
Remarks: Mod all parts of a vehicle in an auto custom shop.
Title: Making Moves
Description: GTA Online – Reach Rank 50.
Remarks: Follow the description as is.
Title: Multi-Disciplined
Description: Attain a gold medal in all applicable hobbies and pastimes.
Remarks: Follow the description as is.
Title: Backseat Driver
Description: GTA Online – Direct a driver to 1st place as co-driver in Rally Mode.
Remarks: Follow the description as is.
Title: Numero Uno
Description: GTA Online – Obtain first place in all competitive game types.
Remarks: Follow the description as is.
Title: Off the Plane
Description: GTA Online – Complete the Introduction.
Remarks: Follow the description as is.
Title: Out of Your Depth
Description: You're gonna need a bigger boat…
Remarks: VIsit Del Perro Pier, take a jet ski and go farther south until you see a red marker, jump off and keep swimming around until a shark eats you.
Title: Pimp My Sidearm
Description: Fully mod a weapon.
Remarks: Follow the description as is.
Title: Red Mist
Description: Complete all Rampages.
Remarks: Follow the Rampages Missions Guide for this one.
Title: Clean Sweep
Description: GTA Online – Finish a Gang Attack without dying and kill at least 10 enemies.
Remarks: Follow the description as is.
Title: Run Like The Wind
Description: GTA Online – Survive for a day with a Bounty on your head.
Remarks: Follow the description as is.
Title: Crew Cut
Description: GTA Online – Complete a Job as a member of a Crew.
Remarks: Follow the description as is.
Title: Decorated
Description: GTA Online – Earn 30 Platinum Awards.
Remarks: Follow the description as is.
Title: Dialling Digits
Description: GTA Online – Call for gang backup for the first time.
Remarks: Follow the description as is.
Title: Enjoy Your Stay
Description: GTA Online – Participate in everything Los Santos has to offer.
Remarks: Follow the description as is.
Title: San Andreas Sightseer
Description: Explore all of Los Santos and Blaine County.
Remarks: Faster to achieve using an aircraft.
Title: Show Off
Description: Complete all Stunt Jumps.
Remarks: Follow the Stunt Jumps Guide for this one.
Title: The Big One!
Description: This ain't no dream no more.
Remarks: Finish the Union Depository mission, just make sure not to skip the cutscenes.
Title: The Government Gimps
Description: You recovered sensitive information from a highly defended federal building.
Remarks: Story-driven.
Title: The Moment of Truth
Description: You have uncovered the truth about Brad.
Remarks: Story-driven.
Title: To Live or Die in Los Santos
Description: Completed the final mission.
Remarks: Story-driven.
Title: Welcome to Los Santos
Description: You repo'd a car and raced it through the heart of a sun-soaked metropolis.
Remarks: Story-driven.
Title: Solid Gold, Baby!
Description: Earn 70 Gold Medals on Missions and Strangers and Freaks.
Remarks: Follow the description as is.
Title: Stick Up Kid
Description: GTA Online – Hold up all 20 Stores.
Remarks: Follow the description as is.
Title: The Midnight Club
Description: GTA Online – Use custom vehicles to win 5 races.
Remarks: Follow the description as is.
Title: Three Man Army
Description: Survive 3 minutes on at least a 3 star Wanted Level with all three characters together off mission.
Remarks: Finish "Mr. Philips" to unlock Trevor. Call the other characters using the in-game mobile phone, pick them up with 4-door vehicle, then head to the Los Santos International Airport at the southern area. Enter the airfield, then keep driving from one end of the airport to the other, just keep in mind not to lose the police.
Title: Three-Bit Gangster
Description: GTA Online – Reach Rank 25.
Remarks: Follow the description as is.
Title: TP Industries Arms Race
Description: Purchase McKenzie Field Hangar and win the arms race.
Remarks: Follow the description as is.
Title: Trading Pure Alpha
Description: Make a profit over your total investments in the stock market.
Remarks: Invest in the enemy companies during Lester's missions using Franklin. Purchase stocks from the other company, then sell the stocks later on when their prices increase
Title: Unnatural Selection
Description: GTA Online – Complete all 10 waves of a Survival.
Remarks: Follow the description as is.
Title: Wanted: Alive Or Alive
Description: Deliver a bail bond target alive.
Remarks: Follow the Trevor Bail Bond Missions Guide for this one.
Title: Waste Management
Description: Purchase the old dock and collect all nuclear waste.
Remarks: Follow the SUBMARINE PARTS LIST Guide to earn this one.
Title: A Fair Day's Pay
Description: It's time for a little getaway.
Remarks: Story-driven.
Title: A Friendship Resurrected
Description: With friends like this who needs enemies?
Remarks: Story-driven.
Title: Blitzed
Description: You performed a classic blitz play.
Remarks: Story-driven.
Title: Diamond Hard
Description: You cleaned out Vangelico to pay back Martin Madrazo.
Remarks: Story-driven.
Title: Small Town, Big Job
Description: You made a big impression at the Paleto Bay Chicken Festival.
Remarks: Story-driven.
Title: Subversive
Description: You stole an experimental super weapon from Merryweather… and gave it back.
Remarks: Story-driven.