| Achievement | How to unlock
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| Attack of the Giants #1 | Get Perfect grade in said challenge.
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| Attack of the Giants #2 | Get Perfect grade in said challenge.
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| Attack of the Giants #3 | Get Perfect grade in said challenge.
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| Attack of the Giants #4 | Get Perfect grade in said challenge.
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| Defeat the Shell Family | Get Perfect grade in said challenge.
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| Defeat the Slime Family | Get Perfect grade in said challenge.
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| Golden Slime Rush #1 | Get Perfect grade in said challenge.
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| Golden Slime Rush #2 | Get Perfect grade in said challenge.
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| Golden Slime Rush #3 | Get Perfect grade in said challenge.
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| Hardcore | Beat wave 24 in Endless Mode.
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| In the Nick of Time | Complete Act 2.
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| Invasion of the Body Snatchers #1 | Get Perfect grade in said challenge.
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| Invasion of the Body Snatchers #2 | Get Perfect grade in said challenge.
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| Invasion of the Body Snatchers #3 | Get Perfect grade in said challenge.
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| Jellyfish Battle | Get Perfect grade in said challenge.
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| Missile-toting Giant | Get Perfect grade in said challenge.
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| Mission Impossible | Beat the Impossible wave either in Challenge Mode or in Story Mode.
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| Perfectionist | Complete story without taking any hit to the cores.
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| Survive the Speedsters' Rampage #1 | Get Perfect grade in said challenge.
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| Survive the Speedsters' Rampage #2 | Get Perfect grade in said challenge.
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| Survive the Speedsters' Rampage #3 | Get Perfect grade in said challenge.
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| Survive without your Blaster | Get Perfect grade in said challenge.
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| Utter Chaos | Get Perfect grade in said challenge.
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| We Survived | Complete Act 1.
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