Wow! 30 is quite a lot! I took a little trip over to Ardalambion and found this list of languages:
1. Quenya - the Ancient Tongue
2. Sindarin - the Noble Tongue
3. Adûnaic - the language of Númenor
4. Westron - the Common Speech
5. Telerin - the language of the Sea-elves
6. Doriathrin - the mothertongue of Lúthien
7. Nandorin - the Green-elven tongue
8. Old Sindarin - between Primitive Elvish and Grey-elven
9. Ilkorin - a lost tongue
10. AVARIN - The Avari were those Elves who remained content with Middle-earth and refused the summons of the Powers
11. Khuzdul - the secret language of Dwarves
12. Entish
13. Orkish and the Black Speech
14. Valarin the unspoken language of the Valar who communicated telepathically
15.Primitive Elvish
MANNISH LANGUAGES:
16. Rohirric – The tongue of Rohan and based on Old English
17. Northern Tongues includes Sméagol (pseudo-Old English) and Smaug (pseudo-Scandinavian
18. Dunlending Dunland tongue
19.The Tongue Of Harad
20. The Tongue Of Khand
21. Drúedainic this was the language of the wild men of the Drúadan Forest
22. Taliska this was the language of Bëor's people, the ancestor of Adûnaic.
Languages Tolkien invented in his youth:
Animalic a language invented by his cousins and he learned it, too. He did not actually invent it himself.
Nevbosh - new nonsense – replaced Animalic and Tolkien contributed to the creation of it with other friends and relatives.
Naffarin replaced Nevbosh and he invented it himself and did not share it with his friends.
For a really complete description of what these are and how they were derived or what they were based on, click here:--->
Ardalambion