Of course duplicates don't count.
List of all current D2 exotics in the spoiler.
[spoiler][b][u]Weapons:[/u][/b]
Borealis
Coldheart
D.A.R.C.I.
Fighting Lion
Graviton Lance
Hard Light
Legend of Acrius
Merciless
MIDA Multi-Tool
Rat King
Riskrunner
Skyburner's Oath
Sturm
Sunshot
Sweet Business
The Prospector
The Wardcliff Coil
Tractor Cannon
Vigilance Wing
[b][u]Warlock Armor:[/u][/b]
Crown of Tempests
Eye of Another World
Nezarec's Sin
Skull of Dire Ahamkara
Karnstein Armlets
Sunbracers
Winter's Guile
Starfire Protocol
Wings of Sacred Dawn
Lunafaction Boots
Transversive Steps
[b][u]Titan Armor:[/u][/b]
Insurmountable Skullfort
Mask of the Quiet One
ACD/0 Feedback Fence
Doom Fang Pauldron
Synthocepts
Actium War Rig
Crest of Alpha Lupi
Hallowfire Heart
Dunemarchers
Lion Rampant
Peacekeepers
[b][u]Hunter Armor:[/u][/b]
Celestial Nighthawk
Foetracer
Knucklehead Radar
Mechaneer's Tricksleeves
Young Ahamkara's Spine
The Dragon's Shadow
Lucky Raspberry
Raiden Flux
Lucky Pants
Orpheus Rig
ST0MP-EE5[/spoiler]
I have 17. Haven't played Titan and Hunter yet.