Make him a half-orc with the Gatecrasher alternate racial trait and the Smash feat. Martial Artist is a good choice because of Sense Weakness. Finding a way to get your unarmed strikes to count as Adamantine would also be great.
Since Martial Artist has no alignment restrictions, you could multiclass him with Barbarian for the Breaker archetype and Smasher or Strength Surge powers. In fact, you could make a pure Barbarian able to punch through walls, though a monk would have the higher unarmed damage.
Too bad the Martial Artist gives up Still Mind, otherwise you could take Monastic Legacy and keep your unarmed damage up.
Ki Strike (Adamantine) helps.
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If your GM is allowing 3rd party products, I think you should check Super Genious Gemes Guide to Feats of Critical Combat. In that small PDF, there is a feat tha allows a monk to do critical hits to unanimate objects, sch as golems and also walls.
It's only 3 dollars, and is a great buy, just as everything else Super Genious.
Played in game where one player was half dragon fighter/rogue with crowbar. He was always smashing through wall instead picking the lock. Usually lead to more encounters due the noise.