Kazumetsa_Raijin
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Yes, it can.
An Unarmed Strike can be made with many different parts of the body as a Monk. An Unarmed Strike is all you need to use Stunning Fist and Punishing Kick.(although technically(RAW) you can use Stunning Fist and Punishing Kick with Weapons... but I doubt any GM would really go for that(RAI).)
You have to retaliate with an Unarmed Strike. You can substitute out a Trip, Sunder, Disarm, Stunning Fist, Punishing Kick, etc for a regular attack when you do Retaliate.