When you start the game, press "Shift" + "K" to bring up the console. All codes need to be enter in lowercase and be aware that the game is still running when you enter the codes.
<br><table width='100%' cellpadding=3 cellspacing=3 border=0><tr valign='top'><th>Achievement</th><th>How to unlock
</th></tr><tr valign='top'><td>Buckshot</td><td>Spread Em
</td></tr><tr valign='top'><td>Explosive Rounds</td><td>Blow Em Up
</td></tr><tr valign='top'><td>Gun Upgrade</td><td>Gun Modder
</td></tr><tr valign='top'><td>Holy Assistance</td><td>Help From Above
</td></tr><tr valign='top'><td>Kill The Nazi Ufo</td><td>Down With Nazi UFOs
</td></tr><tr valign='top'><td>Slug</td><td>Slug It Out
</td></tr><tr valign='top'><td>Take It's Head Off</td><td>Off With Their Heads
</td></tr><tr valign='top'><td>Tutorial Complete</td><td>Now the slaughter can begin
</td></tr></table>
