This Seeking Tech guide will show you how to get the Wall Buster trophy in Astro Bot. For this to unlock, you need to cause a bot wall to collapse.
You can build a wall in the Crash Site level. One of the locations is the entrance to the snowy area. The other is in front of the gold statue.
Once the bot wall is formed, attack one of the bots to cause it to collapse. The trophy should then be unlocked.