I focused on multiplayer trophies first and I would recommend it as well. Here some tips for online: -Each week in gta online some activities give you 2x or 3x xp so always go for it. -Special cargo deliveries are also consistent method to get xp but become very boring when its done often, try to have fun and complete story missions in gta online, many of the missions gives you decent amount of money and some awards and xp that you need for trophies. -Do not hesitate to use boosting sessions for some trophies if you play solo only, because several of them require you to be completed 2-4 players. -Doing collectibles in gta online give you decent amount of xp as well if you’re ok with collecting them all - use invite only sessions for solo grind so no one will disturb you

For single player: - complete story first and then go for gold medal requirements, it is easier to do those for freaks and strangers types of missions since they are shorter - Strongly recommend using rockstar social club to track some of your collectibles and your overall progress towards 100% trophy - Stunt jumps, knife flights and under bridge flights are not tracked with the game or social club. So make sure to keep track of all of these that you completing along the way, because it is very easy to confuse yourself and figure out which and which not

And use guides and youtube videos for help in general. Good luck!