For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download Footsteps SFX Ultimate Pack for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Footsteps Sfx Ultimate Pack v1
“If possible, please buy the package to support the developer”
The footsteps ultimate audio pack contains 100+ high quality, professional footsteps sound effects.
It contains footsteps for the following materials:
-Footsteps carpet
-Footsteps concrete
-Footsteps dirt
-Footsteps glass
-Footsteps grass
-Footsteps gravels/pebbles
-Footsteps metal
-Footsteps rock
-Footsteps snow
-Footsteps water
-Footsteps wood
Formats
The sounds are provided in lossless WAV format
You can hear a demo (with a background music) here: Sound Demo
I highly recommend you to use this footstep pack with the Advanced Footstep System script, that allows you to easily define on which type of material your character is walking.