To get 100% you gotta beat all Six nights and the two secret nights one is old code from fnaf 1 and second is given during phone call of first code and obviously beating 4/20 mode.
4/20 Tutorial Below (Spoilers)
Only use cams for foxy quickly switch in and out every half second or so only doing it less near the end of the night to conserve power
Look at foxy in the hall cam to make her run if not she'll drain about 20 power instead about 5.
Bonnie/chica almost always leave after checking foxy twice regardless of using lights or not but flicking the light on and off doesn't hurt incase you get unlucky sometime as I have just listen for directional audio to know the door.
Freddy is complex but not too hard she always laughs five times before she's about to attack the fifth one being her attack laugh you have roughly 8 seconds (7 if you don't want to risk it) before the door must be shut or she'll get in. then she revolves every other laugh the door needs to be shut to avoid her using the said time frame. However on night 6 at 5:00A.M it's every 3/2 seconds as she gets more active and night 7 4/20 mode at 4A.M Same thing as she's at full speed.
The frames for Freddy can be changed depending on how much risk your willing to take. You'll almost always unless your lucky in the night run out of power at 5A.M at some point it's complete luck whether you win or not but you can minimize the chance by following the above guide. Last tip I can give is use a phone to do stopwatch to keep track of exactly how many seconds if your struggling to count in your head with all how hectic it gets otherwise good luck.