I can't take credit for this. I found it over at the GameSpot Forums:
http://www.gamespot.com/ps3/action/ghostbusters08/show_msgs.php?topic_id=m-1-50172019&pid=944010

Here's the list though:

Rank 01 - Intern Ghostbuster - N/A - gray, black
Rank 02 - Rookie - 108,000 - gray, black
Rank 03 - Greenhorn - 216,000 - gray, black
Rank 04 - Supernatural Investigator - 324,000 - gray, red
Rank 05 - Novice Ghostbuster - 468,000 - gray, red
Rank 06 - Paranormal Examiner - 612,000 - gray, red
Rank 07 - Slime Collector 756,000 - blue, orange
Rank 08 - Spook Spotter - 900,000 - blue, orange
Rank 09 - Spirit Trapper - 1,080,000 - blue, orange
Rank 10 - Ghostbuster - 1,260,000 - dark gray, black
Rank 11 - Proton Slinger - 1,440,000 - dark gray, black
Rank 12 - Slimer Snagger - 1,620,000 - dark gray, black
Rank 13 - Phantom Blaster - 1,836,000 - gray, blue
Rank 14 - Ecto Exterminator - 2,052,000 - gray, blue
Rank 15 - Elite Ghostbuster - 2,268,000 - gray, blue
Rank 16 - Wraith Wrangler - 2,484,000 - gold, black
Rank 17 - Soul Hunter - 2,736,000 - gold, black
Rank 18 - Specter Slayer - 2,988,000 - gold, black
Rank 19 - Defender of New York - 3,276,000 - red, black
Rank 20 - Ghostbuster of the Year - 3,636,000 - black, black

I'm pretty stoked that I'm only 600k away from Ghostbuster of the Year. I'll be there in a matter of an hour or two.

The problem is that it's too easy to achieve. They should have had 40 ranks and then 3 or 4 “prestige” modes and upon completion of those you could unlock something. Even if it was just the GB2 logo gold proton pack or new characters to play as, it would have been better than nothing.

DLCs dude. DLCs.

Yehome;151587
DLCs dude. DLCs.

IF they do any.