There are 187 objectives in total in GTA San Andreas which are REQUIRED for
100% completion. There are various side missions and objectives which are not
required, and there are various objectives included in some of the objectives
listed below which are not required separately, but are required altogether. For
example Chiliad Challenge 1 gives you no extra percent, neither does the second
or third on their own, however after winning all three races you'll be awarded
with the percentage. The same thing goes with the import export. You get no
percent for each single car, but you do get percent for the fully completed
list. If you wrote down your percentages after every single objective (as I did)
you'll notice the percentage jumps from 0.53% for one objective to 0.54% for the
next. This isn't programmed into the game though. What is programmed is that you
receive 0.534759358% per objective which is then rounded up or down to
two decimal places. If you're missing 0.53% when you come to the end of the
game, it will be any one of the objectives listed below. One last note is that
you receive no percent for the first three street races in Los Santos because
you did them in missions and received the percentage there. It's rather
confusing, but all you need to know is that you must have fully completed every
objective below for 100%.
Special thanks to my good friend Geordie Dude for assisting me in the
creation of this list.