| Achievement | How to unlock
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| - Unlock all commander abilities.
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| - Fully upgrade an aerial slow turret.
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| - Fully upgrade a beam turret.
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| - Fully upgrade a bomb turret.
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| - Fully upgrade a booster turret.
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| - Classic map 1 has been completed in assault mode.
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| - Classic map 2 has been completed in assault mode.
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| - Classic map 3 has been completed in assault mode.
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| - Classic map 4 has been completed in assault mode.
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| - Classic map 5 has been completed in assault mode.
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| - Classic map 6 has been completed in assault mode.
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| - Fully upgrade a flamer turret.
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| - Reach maximum commander level.
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| - Fully upgrade a laser turret.
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| - Fully upgrade a line laser turret.
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| - Fully upgrade a missile turret.
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| - Complete mission 1 of the original campaign.
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| - Complete mission 10 of the original campaign.
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| - Complete mission 11 of the original campaign.
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| - Complete mission 12 of the original campaign.
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| - Complete mission 13 of the original campaign.
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| - Complete mission 14 of the original campaign.
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| - Complete mission 15 of the original campaign.
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| - Complete mission 16 of the original campaign.
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| - Complete mission 17 of the original campaign.
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| - Complete mission 18 of the original campaign.
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| - Complete mission 19 of the original campaign.
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| - Complete mission 2 of the original campaign.
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| - Complete mission 20 of the original campaign.
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| - Complete mission 3 of the original campaign.
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| - Complete mission 4 of the original campaign.
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| - Complete mission 5 of the original campaign.
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| - Complete mission 6 of the original campaign.
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| - Complete mission 7 of the original campaign.
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| - Complete mission 8 of the original campaign.
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| - Complete mission 9 of the original campaign.
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| - Reach wave 100 in endless mode on psycho difficulty.
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| - Reach wave 150 in endless mode on psycho difficulty.
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| - Fully upgrade a slow turret.
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| - Fully upgrade a sniper turret.
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| - Complete a classic assult level without upgrading any turrets.
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| - Unlock all Sentinel weaponry.
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