-grim&grave
-king&warlord
-quenn&crone
-rise of tomb kings
-norsca
-curse of the vampire coast
-twisted&twilight
-silence&fury
-ogre part of omens of destruction dlc
-chaos dwafs
This 10 dlcs will grand you access to 15 races you are missing.

general advice :The base game wh1/2 is a good choice if you want more lords to play with,they are more 'vanilla' like too -good for start without very stand outish mechanics but if you want new races with all units to the roster and can live without some lords then (ironically) "lordpacks" dlcs are the way to go and older games wh1 and 2 can be totally skipped.

1.Empire
4dlcs
-game wh 1 gives you karl Franz and Balthasar Gelt
-Grim&grave dlc will give you Volkmar and its the only way to acguire free militia,knights of the blazing sun and flagelans to your empire armies
-Hunter&beast gives you Markus Wolfheart and archers + war wagons
-Thrones of decay - Espeth LL + marienburg lanship,steam tank variant, new knight order and new higher tier muskieter versions

2.Dwarfs
3dlcs
-Wh1 base game gives you Thorgrim and Urgrim
-king and the warlord - balista,rangers and Belegar
Thrones of decay : Malakai LL + axetrowing artillery, 2 new slayer units,thunderers variant, thunderbarge airship
Note that you will also get Thorek and Gromnindal if you own any of this

3.Vampire Counts
2dlcs
-wh1 base game gives you Manfred and Kemmler with Krell as summon
-grim&grave gives Ghorst+his units- mortis engine,corpse cart.
You get Izabella and Vlad von carstein too no matter which one you own

4.Greenskins
4dlcs
-wh1 base game : Azhag,Grimgor
-king&warlord: Skarsnik, squigs, goblin scalptakers
warden&paunch: Grom, troll variants,snotling wagons,Rogue Idol
Omens of destruction: Gorbad black orcs with shields, amngler squigs, gaint squig,arachnok with catapult, bolt throwers
Wurzag is free if you own any of those

5.Warriors of chaos undiveded
5dlcs(belakor is free)
-warriors of chaos dlc:adds Archaon,Kholek and Sigvald
champions of chaos dlc: Valkia,Festus,Azazel,Vilitch chaos warshrine unit
Shadow of change :tzaangors, cockatrice,mutalith vortex beast,centigors of tzeentch,changebringers
thrones of decay(tamurkhan part): toad dragon,rot knights,bile trolls,plague ogres,pestigors
omens of destruction: khornegors, bloodbeasts,wrathbringers,skulltakers,slaughterbrute
slannesh

6.Wood Elves
2dlcs
-realm of the wood elves:Orion ,Durthu,Drycha and her companion Coedill
-twisted&twilligh:Sisters of twilight + zoats,great stags,upgraded war dancers,legendary hero Ariel

7.Beastman
5dlcs
call of beastman: Khazrak,Malagor,Morghur
silence&fury:Taurox+ jabberslythe and gorgon,new chariot
shadow of change: tzaangors and centigors of tzeentch,elemental of beast
thrones of decay: pestigors
omens of destruction: khornegors

8.High elves
3dlcs
-wh2 base game: Teclis,Tyrion
-quenn&crone: Allariel, two archer types
-warden&paunch: Eltharion and -rangers,upgraded spearman,new phoenix variant, lions pack and lions chariot, Mistwalkers units in Tor yvresse
Free if you own anything of the above: Imrik,Alith Anar

9,Dark elves
3dlcs
wh2 base game:Malekith,Morathi
-queen&crone:Hellebron and:witch elves with whips(sisters of slaughter),cav with spells(doom fire warlocks) and kharibdis- hydra reskin
-shadow&blade:Malus+ medusa and chariot variant
free if own any of the above:Lokhir and Rakarth

10.Lizardman
4dlcs
-wh2 base game:Mazdamundi,Krogqar
-prophet&warlock:Tahenhaunin,red skinks,salamanders,3 new variants for basic dinos
-Hunter&beast: Nakai, dread saurians,razordons,new kroxigors variant
-silence&fury:Oxyotl + new chameleons,coatl,troglodon
free if you own any of those: Gor-rok and Lord Kroak, Tiktaqtoe

11.Skaven
4dlc
-wh2 base game:Scrolk and Queek
-prophet&warlock: Ikit; jezzails,ratlings,doom-flayers
-shodow&blade:Sniktch, eshin halbadiers,poison wind mortals,warp grinder
-twisted&twilight: Throt, wolf-rats pack,broodhorror,mutated rat-ogre, Ghoritch hero
free if you own any of the above:Trentch craventail

12.Cathay
1dlc
Shadow of change: Jade dragon LL, war drums, celestial bird,celastial lion,jade lions,crows
13.Kislev
Shadow of change: Ostankya LL things in the wood, Beast elemental,kislevs crosbowman,new kossacs base invrantry, ice dragon
14.Tzeenthch
Shadow of change: Changeling LL + vortex beast ,cockatrice.tzeenthc marked gors and centigors,flamers on discs
15.Nurgle
Thrones of decay: ThamurkanLL toaddragon,blightknights new cav,bile trolls,bile ogres,pestigors

Bretonia
-all content for that race is free
.Norsca
only race pack is avaible
Tomb Kings
only race pack is avaible
Vampire Coast
only race pack is avaible
Ogres
- race pack: goldtooth,scrag
omens of destruction: Golgf-ag LL , yeti, pigriders, new maneater variant,blood vultures,thunderfang.
chaos dwarves
-only racepack avaible
khorne 1dlc
-omens of destruction: Skulltaker LL, khornegors, bloodbeasts,wrathbringers,skulltakers,slaughterbrute
slannesh
-no addicional content avaible for now.