100% Experience

Hello everybody, after almost 5 months after buying the game I got 100 percent on it. It was frustrating and painful, especially stunts (the last jump on g-spotlight gets counted automatically don't waste hours on getting "unique stunt completed" as I did) but I finally got a gta for 100% completion. If you are currently trying to get it on 100 percent I wish you patience because it is nerve racking. Also to check the status of collectibles you got and stunts you finished you should use web site gtasnp on which you can track your progress. Thanks to the person who recommended it to me. if I hadn't checked it I would still be trying to hit last jump on g spotlight ( it turns out I forgot about one of the very first stunt jumps) ))
Wish you all the best GTA lovers
P.S
It is just my experience how I could have completed some of the 100% requirements in an easier way, I'm not going to cover all the steps since there are many more detailed guides about it. This guide was created to serve as a piece of advice how to beat the game more efficientely.

Stunts

I would recommend to keep the track of stunts from the very beginning of the game.
Try to complete all stunts on one island and then move to a different one, so you don't have to go back and forth as I did in order to get the achievement.
P.S
3rd jump on G-Spotlight mission is broken, it counts as soon as you finish the mission. Don't try to get "unique stunt completed" message since it doesn't pop up due to some sort of a game bug.

RC Toyz missions

Complete these after finishing the main campaign, nothing extravagant. Missions are quite easy to complete

Ice Cream delivery,and taxi missions

In order to get 100% you need to complete 100 taxi fares (takes time but not hard to do) and 50 ice cream deliveries. You may face a problem with ice cream deliveries when you have completed 50 orders but still didn't get the completeion mark for it. What I did was to complete another 30-40 orders and save the game. Then it counted my progress

100 hidden packages

Just keep the track of collected packages, nothing hard just time consuming

Paramedic, firefighter, pizza guy, and policeman missions

I would recomment to do this as soon as possible since after completing the level 12 of each of this missions guarantees you
Infinite sprint for completing paramedics missions
150 armor for police missions
150 health for completing all pizza delivery missions missions
complete resistance to fire for firefighters missions.
Also if you are completing the paramedics missions after unlocking all islands it will be more difficult for you since on high levels you will have to drive to all 3 islands which takes A LOT of time

Hidden achievements during the missions (spoilers)

1st Kill all hostile NPCs during the mission "Demolition man" using the chopper's blades.
2nd Kill the property developer with a golf club during "Four Iron"
3rd Use the M4 to take out Diaz during the mission "Rub Out"
4th Complete "G-Spotlight" without falling from the rooftops

The Result