The game is completely done to an absolute 100%, which includes not only the standard 100% completion, but also additional achievements.

What has been completed
Completed the storyline to 100%
Completed all 70 unique jumps
Completed the thief mission (stole $10,000 worth of items)
Achieved 100% relationship with all girls
Purchased all clothes in all stores:
Binco
Sub Urban
ZIP
ProLaps
Victim
Didier Sachs
Winned the Lowrider Challenge (after the Cesar Vialpando mission)
Completed three levels of the dance mini-game
Completed two Beat the Cock! triathlons
Completed the Beefy Baron minigame (record: 25 cars)
Set the highest score in all arcade games (1st place in all lists)
Win one game of pool
Highest score in basketball
Intercepted Big Smoke's couriers (one with weed, one with money)
Acquired gold medals in all four schools
Maximized all skills, including gambling
Reached the "King of San Andreas" rating
Earned $999,999,999
Captured all gang territories
Won all gambling minigames at least once
Additional
The challenge was inspired by YouTuber Jet GTAshnik, who was the first to claim an absolute 100% completion of the game:

In 2014 (original) - 88 hours
In 2022 (Definitive Edition) — 67 hours
I beat his result, completing the gameplay with an absolute 100% in 65 hours on the original version.

All skills and abilities are maxed out. The game was played on Alexander Polyak's build with all fixes.

Author: zaraban