Here is the full list of all 428 Sleengster achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 426 bullets
Shoot 427 bullets
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Shoot 342 bullets
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Shoot 277 bullets
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Shoot 268 bullets
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Shoot 237 bullets
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Shoot 137 bullets
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Shoot 106 bullets
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Shoot 1 bullet
Shoot 2 bullets