To platinum it is not difficult, the problem is in longevity.
Here is the official list of PlayStation 3 trophies divided into their respective categories; they also apply to the Xbox world.
Bronze (40)
1) Waste management
Buy the old dock and recover all the nuclear waste.
2) Wanted: alive or alive
Deliver a wanted fugitive alive.
3) Unnatural selection
GTA Online: Complete all 10 waves of a Survival.
4) Finance magician
Make a profit on your total stock market investments.
5) TP Industries expands
Buy McKenzie Hangar and win the arms race.
6) Cheap gangsta
GTA Online: Reach level 25.
7) Three men, one army
Endure 3 minutes with a 3-star suspicious level with the 3 characters together not on a mission.
8) Midnight Club
GTA Online: Use custom vehicles and win 5 races.
9) Master robber
GTA Online: Rob all 20 shops.
10) Exhibitionist
Complete all the crazy stunts.
11) Run like the wind
GTA Online: Survive for a day with a bounty on your head.
12) I saw it red
Complete all Violence.
13) Pumped weapons
Fully customize a weapon.
14) More or less I get by
You will need a bigger boat ...
15) Just landed
GTA Online: Complete the Introduction.
16) Number One
GTA Online: Finish first in all types of competitive matches.
17) Los Santos Customs
Fully customize a vehicle.
18) Robbery and reimbursed
GTA Online: Kill the Thief Who Robbed You.
19) From deep space
Collect and deliver all parts of the spaceship.
20) Have a nice stay
GTA Online: Experience everything Los Santos has to offer.
21) Dial a number
GTA Online: Call for reinforcements from the gang for the first time.
22) Cut for the crew
GTA Online: Complete a task as a member of a crew.
23) For a hair
Complete all Under the Bridge and Knife Flight challenges.
24) Clean clean
GTA Online: Complete a Gang Attack without dying and killing at least 10 enemies.
25) Golden Copilot
GTA Online: As a co-driver, finish first in a rally mode race.
26) The American Dream
GTA Online: Own an apartment, garage and insured vehicle.
27) Selfless Acolyte
Deliver an unsuspecting victim to the Altruist Sect.
28) Follow that car!
Purchase Downtown Cab Co. and complete a private ride.
29) A mystery solved
Solve the Leonora Johnson mystery.
30) Hands with holes
Spend over $ 200 million on all three characters.
31) This is Los Santos!
You confiscated a car and took it to the max in a sun-kissed metropolis.
32) The moment of truth
You found out the truth about Brad.
33) The stupid feds
You recovered sensitive information from a closely guarded federal building.
34) The Big Shot!
It is no longer a dream.
35) Subversive
You stole an experimental super weapon from Merryweather ... and then you returned it.
36) Small town, big shot
You left an indelible memory of you at the Paleto Bay Chicken Festival.
37) Hard as a diamond
You cleaned up the Vangelico jewelry shop to pay off your debt to Martin Madrazo.
38) Blitz
You performed a classic blitz.
39) A Risen Friend
With friends like that, who needs enemies?
40) Our daily bread
It's time for a little… escape.
Silver (6)
41) San Andreas Explorer
Explore the entire Los Santos and Blaine County area.
42) Multidisciplinary
Get a gold medal in all sports and pastimes.
43) I do things, I see people
GTA Online: Reach level 50.
44) Kifflom!
Walk all the way down the road to enlightenment… or not.
45) Precious decorations
GTA Online: Earn 30 Platinum Medals.
46) Live and Die in Los Santos
You have completed the last mission.
Gold (3)
47) Cast gold, baby!
Earn 70 gold medals in main missions and in strangers and madmen missions.
48) Career in Crime
Complete the game 100%.
49) Above the law
GTA Online: Reach level 100.
Platinum (1)
50) Legend of Los Santos
Congratulations! You are the biggest Vinewood star!
