<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>Able Commander</td><td>Unlock all commander abilities.
</td></tr><tr valign='top'><td>Aerial Slow Upgrade</td><td>Fully upgrade an aerial slow turret.
</td></tr><tr valign='top'><td>Alien Extinction</td><td>Kill 1,000,000 aliens.
</td></tr><tr valign='top'><td>Alien Killer</td><td>Kill 1000 aliens.
</td></tr><tr valign='top'><td>Alien Massacre</td><td>Kill 100,000 aliens.
</td></tr><tr valign='top'><td>Alien Slaughter</td><td>Kill 10,000 aliens.
</td></tr><tr valign='top'><td>Beam Upgrade</td><td>Fully upgrade a beam turret.
</td></tr><tr valign='top'><td>Bomb Upgrade</td><td>Fully upgrade a bomb turret.
</td></tr><tr valign='top'><td>Booster Upgrade</td><td>Fully upgrade a booster turret.
</td></tr><tr valign='top'><td>Classic Assault 1</td><td>Classic map 1 has been completed in assault mode.
</td></tr><tr valign='top'><td>Classic Assault 2</td><td>Classic map 2 has been completed in assault mode.
</td></tr><tr valign='top'><td>Classic Assault 3</td><td>Classic map 3 has been completed in assault mode.
</td></tr><tr valign='top'><td>Classic Assault 4</td><td>Classic map 4 has been completed in assault mode.
</td></tr><tr valign='top'><td>Classic Assault 5</td><td>Classic map 5 has been completed in assault mode.
</td></tr><tr valign='top'><td>Classic Assault 6</td><td>Classic map 6 has been completed in assault mode.
</td></tr><tr valign='top'><td>Flamer Upgrade</td><td>Fully upgrade a flamer turret.
</td></tr><tr valign='top'><td>Hero Commander</td><td>Reach maximum commander level.
</td></tr><tr valign='top'><td>Laser Upgrade</td><td>Fully upgrade a laser turret.
</td></tr><tr valign='top'><td>Line Laser Upgrade</td><td>Fully upgrade a line laser turret.
</td></tr><tr valign='top'><td>Missile Upgrade</td><td>Fully upgrade a missile turret.
</td></tr><tr valign='top'><td>Mission 1</td><td>Complete mission 1 of the original campaign.
</td></tr><tr valign='top'><td>Mission 10</td><td>Complete mission 10 of the original campaign.
</td></tr><tr valign='top'><td>Mission 11</td><td>Complete mission 11 of the original campaign.
</td></tr><tr valign='top'><td>Mission 12</td><td>Complete mission 12 of the original campaign.
</td></tr><tr valign='top'><td>Mission 13</td><td>Complete mission 13 of the original campaign.
</td></tr><tr valign='top'><td>Mission 14</td><td>Complete mission 14 of the original campaign.
</td></tr><tr valign='top'><td>Mission 15</td><td>Complete mission 15 of the original campaign.
</td></tr><tr valign='top'><td>Mission 16</td><td>Complete mission 16 of the original campaign.
</td></tr><tr valign='top'><td>Mission 17</td><td>Complete mission 17 of the original campaign.
</td></tr><tr valign='top'><td>Mission 18</td><td>Complete mission 18 of the original campaign.
</td></tr><tr valign='top'><td>Mission 19</td><td>Complete mission 19 of the original campaign.
</td></tr><tr valign='top'><td>Mission 2</td><td>Complete mission 2 of the original campaign.
</td></tr><tr valign='top'><td>Mission 20</td><td>Complete mission 20 of the original campaign.
</td></tr><tr valign='top'><td>Mission 3</td><td>Complete mission 3 of the original campaign.
</td></tr><tr valign='top'><td>Mission 4</td><td>Complete mission 4 of the original campaign.
</td></tr><tr valign='top'><td>Mission 5</td><td>Complete mission 5 of the original campaign.
</td></tr><tr valign='top'><td>Mission 6</td><td>Complete mission 6 of the original campaign.
</td></tr><tr valign='top'><td>Mission 7</td><td>Complete mission 7 of the original campaign.
</td></tr><tr valign='top'><td>Mission 8</td><td>Complete mission 8 of the original campaign.
</td></tr><tr valign='top'><td>Mission 9</td><td>Complete mission 9 of the original campaign.
</td></tr><tr valign='top'><td>Psycho Defender</td><td>Reach wave 100 in endless mode on psycho difficulty.
</td></tr><tr valign='top'><td>Psycho Master</td><td>Reach wave 150 in endless mode on psycho difficulty.
</td></tr><tr valign='top'><td>Slow Upgrade</td><td>Fully upgrade a slow turret.
</td></tr><tr valign='top'><td>Sniper Upgrade</td><td>Fully upgrade a sniper turret.
</td></tr><tr valign='top'><td>Turret Expert</td><td>Unlock all turrets.
</td></tr><tr valign='top'><td>Turret Spammer</td><td>Complete a classic assult level without upgrading any turrets.
</td></tr><tr valign='top'><td>Weapon Master</td><td>Unlock all Sentinel weaponry.
</td></tr></table>
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