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