How many different techniques of meditation did Buddha teach? I was just wondering how many different types of meditation techniques did Buddha teach? 

I know the below

Anapana, 
Vipassana, 
Charnal Ground, 
Metta Bhavana,

I am looking for a list of meditations for my research purpose.
Anapana, Vipassana, 32 body parts meditation, Metta Bhavana,
I am looking for a list of meditations for my research purpose.

They're parts of what's called the Kammatthana, the Forty objects of meditation as classified in the Visuddhimagga. The wiki page also gives a pretty good summary about them.