Here are 15 Certified Compatible items per each class:

Scout:
1-Biohazard Breacher
2-Epilogue Locks
3-The Feet of Engineering (Invasion)
4-Boston Watch
5-Bonk Breather
6-The Clearance Card
7-Can Carrier (Bonk)
8-Layered Liaison
9-Bullet Bandolier
10-The Vanguards Guards
11-The Bonk Belt
12-Radio Free Teufort
13-The Mann Buster (Melee Weapon)
14-Healthcare Hog (Taunt)
15-Head Games (Taunt)

Soldier:
1-The Turing Chest
2-War Face
3-Beehive Brawler
4-Fighter Bomber
5-The Snow Stormer
6-Soldered Sergeant
7-Plated Freedom
8-Crusher’s Cap
9-Old Glory
10-Supreme Overlord
11-One Machine Army
12-Sergeant Smack Talk (Taunt)
13-Yappin’ Yankee
14-ShellShock (Engineer, Heavy, Pryo, Scout and Soldier)
15-Grunt Armor

Pryo:
1-Hellscape
2-Veterans Visor
3-Deserter’s Duster
4-Serial Griller
5-Money Furnace
6-Fission Fuel
7-Issued Protector
8-Demented Droid
9-The Insulater
10– OI’ Chum
11-Burnt Brows
12-Stalker Burner
13-The Cocktail Surprise (Throwing item
14-Arsonists Artistry (Taunt)
15-Cremator’s Cookout

Demoman:
1-Eyelander’s One-Piece
2-Paladins Heavy Plate
3-Gothic Gauntlets
4-Glasgow Greaves
5-Scavengers Scrap
6-Knights Oath
7-Kraken She’ll
8-Burst Blocker
9-Barrel O Booty
10-Blast Boots
11-Suave Shave
12-The Guarded Grenadier
13-Re-Bootlegger
14-Boom Box (Taunt)
15-Rock Bottom (Taunt)

Heavy:
1-Underground Lead
2-Crusher’s Hardsuit
3-Main Event
4-Muscle March
5-Bolted Belt
6-Heavy Damage
7-Distinguished Despot (Frontline)
8-Nuclear Winter
9-Private Army
10-The Debreather
11-The Siberian Smoker
12-Class of’ 88
13- Natalya (Primary Weapon)
14-Bolshevik Bedtime (Taunt)
15-Ring King (Taunt)

Engineer:
1-Back Pain (Medic, Engineer and Sniper)
2-Tele-Trotters
3-The Dressed and Alive
4-The Third Person Shooter
5-Provisioneer
6-Mechanical Mann
7-Bee Cave Bomber (Frontline)
8-Bundled Up Builder
9-Texas Ranger
10-Machine Clean
11-Portable Provisions
12-Re-Supslippers
13-ShellShock (Shotgun Frontline)
14-Rasisin’ The Steaks (Taunt)
15-Savvy Schematics (Taunt)

Medic:
1-Count’s Clock
2-Surgical Strike
3-Armored Core
4-Medic’O Tron
5-Guardian Greaves
6-Commander’s Coat
7-Uber-Breather
8-Dove Bomber
9-The Hiking Healer
10-Surgeon’s She’ll
11-Frontline Worker
12-Vintage Whiskers
13-The Puncture Test
14-Heartbreaker
15-Contagious Outbreak

Spy:
1-General’s Weather (Frontline)
2-Half-Blind Bandit
3-Files Formals
4-The Cash-Out
5-Le Communicateur
6-Cloak and Tabard
7-Spyware
8-Bon Voyage
9-The Sex Bom
10-Command Cap (Frontline)
11-Breadline Bonnet (All Class)
12-You Shanker
13-The Gentle End (Revólver)
14-Your Mother! (Taunt)
15-SHHH! (Taunt)

Sniper:
1-Hailstorm Hunter
2-Confidential Cover
3-Gunman”S Guise
4-Sharpshooting Stalker
5-The Razorfront
6-Last Resort
7-She’ll Slouch
8-Hardened Hitman
9-Colder Killer
10-Caffeine Canister
11-Badland Blanket
12-Best in Class (Medel)
13-The Thread Cutter (Sniper Rifle)
14-Cold Caller
15-The Primary Instinct (All class taunt)