Quickly press [Left] two times, [Right] two times, [Up] [Down] two times [Up] [Down] [Jump] three times at the title screen. A sound will confirm correct code entry. Start a new game to begin with 40 lives.
<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>Addicted to destruction</td><td>Complete the game on any difficulty setting 2 times in a row.
</td></tr><tr valign='top'><td>Award for effort</td><td>Earn an extra life.
</td></tr><tr valign='top'><td>Band of followers</td><td>Gather 10 quadropods on the screen on level 6.
</td></tr><tr valign='top'><td>Bodyguard</td><td>Complete the game on any difficulty setting in coop mode without any single shot and deaths from player 2.
</td></tr><tr valign='top'><td>Collector</td><td>Collect all power-ups in the game (including all hidden power-ups).
</td></tr><tr valign='top'><td>Cure for arachnophobes</td><td>Destroy level-4 boss.
</td></tr><tr valign='top'><td>Cyborg for dinner</td><td>Destroy level-4 miniboss.
</td></tr><tr valign='top'><td>Devil's colors</td><td>Devil's colors.
</td></tr><tr valign='top'><td>Disturbed symbiosis</td><td>Destroy level-5 boss.
</td></tr><tr valign='top'><td>Empty shell</td><td>Destroy level-6 boss.
</td></tr><tr valign='top'><td>Explorer</td><td>Find all hidden power-ups.
</td></tr><tr valign='top'><td>Eye surgery</td><td>Destroy level-1 boss.
</td></tr><tr valign='top'><td>Flesh and bones</td><td>Flesh and bones.
</td></tr><tr valign='top'><td>Freedom to crawlers</td><td>Freedom to crawlers.
</td></tr><tr valign='top'><td>Godlike</td><td>Complete the game on any difficulty setting with no deaths.
</td></tr><tr valign='top'><td>Golden Cyborg</td><td>Earn 500000 points.
</td></tr><tr valign='top'><td>Good listener</td><td>Listen all tracks in music test menu (Complete the game to unlock it).
</td></tr><tr valign='top'><td>Gunslinger</td><td>Complete the game on any difficulty setting using only alternate firing.
</td></tr><tr valign='top'><td>Heart attack</td><td>Destroy level-2 boss.
</td></tr><tr valign='top'><td>Heavy lifting</td><td>Heavy lifting.
</td></tr><tr valign='top'><td>Hero for ages</td><td>Complete the game on 'Normal' difficulty setting.
</td></tr><tr valign='top'><td>Inhuman</td><td>Complete the game on 'Hard' difficulty setting.
</td></tr><tr valign='top'><td>Insect control</td><td>Destroy level-3 boss.
</td></tr><tr valign='top'><td>Intestinator</td><td>Destroy level-5 miniboss.
</td></tr><tr valign='top'><td>Life stealer</td><td>Steal a life while playing coop mode.
</td></tr><tr valign='top'><td>Out of misery</td><td>Destroy level-3 miniboss.
</td></tr><tr valign='top'><td>Real power</td><td>Use maximum charged alternate fire for all weapons.
</td></tr><tr valign='top'><td>Savior of the universe</td><td>Complete the game on 'Easy' difficulty setting.
</td></tr><tr valign='top'><td>Sharpshooter</td><td>Kill 10 enemies with one shot.
</td></tr><tr valign='top'><td>Squashed</td><td>Squashed.
</td></tr><tr valign='top'><td>Super deadman</td><td>Die 100 times.
</td></tr><tr valign='top'><td>Survival of the fittest</td><td>Destroy level-7 boss.
</td></tr><tr valign='top'><td>The ultimate team</td><td>Complete the game on any difficulty setting in coop mode.
</td></tr><tr valign='top'><td>Total devastation</td><td>Destroy everything.
</td></tr><tr valign='top'><td>Ultra Ultimate Super Cyborg</td><td>Complete the game on 'Hard' difficulty setting with no deaths.
</td></tr></table>