Originally, there were 49 achievements/trophies (plus the PlayStation-exclusive Platinum Trophy) in GTA V, although this was increased in the enhanced version, with one additional award related to the new first person view. To accommodate this extra award, the gamerscore/trophy grade of several other awards were lowered in the enhanced editions; see the tables below for details.
In total, there are currently 77 Achievements (Xbox) or 78 Trophies (PlayStation) in Grand Theft Auto V and Online:
Enter Director Mode using any of your own GTA Online characters.
Freemode Events Secret Achievements/Trophies
Unlock all the animals.
The Doomsday Heists Update
Set up The Doomsday Heist.
Kill another player with the Orbital Cannon.
Complete all 3 Elite Challenges in The Doomsday Heist.
Complete all 3 Criminal Mastermind challenges in The Doomsday Heist.
The Doomsday Heists Update Secret Achievements/Trophies
The Data Breaches
Complete Act I of The Doomsday Heist as Leader or Crew.
The Bogdan Problem
Complete Act II of The Doomsday Heist as Leader or Crew.
The Doomsday Scenario
Complete Act III of The Doomsday Heist as Leader or Crew.
A World Worth Saving
Complete The Doomsday Heist as Leader or Crew.
The achievement "The Midnight Club" is a reference to the Midnight Club series, a racing game series also made by Rockstar Games.
The achievement "Pimp my Sidearm" is a reference to the television show Pimp my Ride.
The achievement "To Live or Die in Los Santos" is a reference to the 1985 movie To Live and Die in L.A..
The achievement "Diamond Hard" may be a reference to the 1988 action movie Die Hard.
The achievement "Wanted: Alive or Alive" is a reference to the phrase "wanted: dead or alive", commonly associated with bounty hunting in the Wild West.
The icon of the achievement "Altruist Acolyte" resembles the Apple logo.
The description of the achievement/trophy "Out of Your Depth", "you're gonna need a bigger boat", is a direct reference to the famous quote made by Police Chief Martin Brody in the 1975 film Jaws, appropriate as the trophy requires the player to be eaten by a shark.
The achievement "Unnatural Selection" shares its name with an achievement in Red Dead Redemption.
The achievement "Can't Touch This" is a reference to to MC Hammer's 1990 hit "U Can't Touch This". It also shares its name with Gold Medal objectives in Complications and Mr. Richards.
The achievement "Dead Presidents" is a reference to the 1995 crime movie of the same name written by Michael Henry Brown.
The Achievement "Live a Little" does include combined purchases made with both of a player's Online characters. It only counts the purchase prices of vehicles and not the cost of modifications (if any).
Some achievements are reference or similar to GTA IV: