Those are people with actual titles in real life. To get them acknowledged by chess.com, they had to send in documented proof that they are who they said they are and that they legitimately have the title. It has nothing to do with their chess.com rating.
Chess.com Titles?
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Chess.com doesn't award titles. They do verify existing titles and give titled players free diamond and a few other perks though. As you might imagine, many titled players use chess.com to relax and don't really give a sh#t what their ratings are here. Hope that cleared it up for you.
Late again. 
Ooohhh I get it now, that makes a lot of sense actually. I thought I heard somewhere that the ratings system was different, I was still wondering how there were the titles. Thanks for telling me 😄
Thanks both of you guys for your input, now I need to get GM for free diamond membership! 😎
You can set your sights a little lower. 
This is from the article in Help & Support:
Qualifying Titles
GM - Grandmaster
WGM - Woman Grandmaster
IM - International Master
WIM - Woman International Master
FM - FIDE Master
NM - National Master
CM - FIDE Candidate Master
One last question then- do you know the ratings needed for those titles?
I think it's something like this-
GM- 2500
IM- 2400
FM- 2200
NM- ????
CM- 2100
GM- 2500
IM- 2400
FM- 2200
NM- ????
CM- 2100
Nope, but I bet Mr. Google does...
Qualifying Titles
GM - Grandmaster
WGM - Woman Grandmaster
IM - International Master
WIM - Woman International Master
FM - FIDE Master
NM - National Master
CM - FIDE Candidate Master
If you aren't a woman, the requirements, barring an automatic title, are
GM - To have at least once reached 2500 FIDE with at least 27 games at a tournament performance rating of at least 2599.5 in the form of at least two norms and at least 35% performance at a FIDE rated event run by an IA or FA and at least 1/3 with a minimum of 3 opponents holding the GM title.
IM - To have at least once reached 2400 FIDE with at least 27 games at a tournament performance rating of at least 2449.5 in the form of at least two norms and at least 35% performance at a FIDE rated event run by an IA or FA and at least 1/3 with a minimum of 3 opponents holding the IM or GM title.
FM - 2300 FIDE
CM - 2200 FIDE
NM - In the USCF, this requires a rating of 2200. For other countries, see your federation's regulations on this title.
For WGM and WIM, drop the rating and tournament performance ratings by 200 and note that opponents with IM can count for the WGM and WIM titles.
Ok guys, I have an actual question this time. I've noticed a number of people with the titles, FM, GM, etc. It looked normal until I saw inconsistent ratings between them (GM having 2350, CM with 2300, etc.) So, does anyone know the criteria for certain titles for Chess.com? If so, please reply. Any answer is appreciated! Thanks!