There are FAR too many things to list here.
It quite possibly would take less time for you to watch all the seasons of episodes than it would be for one person (or multiple people) to write all the things that Family Guy has made fun of all these years.
However, some of the top things/people Family Guy has referenced would perhaps be
Chat with our AI personalities
Both South Park & Simpsons have taken jabs at Family Guy
all of them
Wasted Talent
S06|E12Long John Peter
The Drive In Movies