The Raid is the third level of the game. Even if you start this level from the Select Level menu you will have other weapons available. Don’t shoot any guns, just switch to the baseball bat immediately and get running/jumping through the level. You should also switch off Automatic Weapon Switching in the settings menu to avoid accidentally shooting.
The achievement doesn’t need a specific difficulty level to pass, so just choose Easy. You don’t have to pass it in a single life so don’t worry about dying. You can also kick using
if you get overwhelmed by bad guys. You don’t need to kill everyone to pass, so just keep running and jumping and only worry about killing the bad guys when you stop progressing.
Towards the end of the level there are a few flaming pipes which need to be turned off in order to progress but there’s nothing too tricky. I got this achievement in around five to ten minutes and died around three times before finishing the level.