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 424 bullets
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Shoot 279 bullets
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Shoot 272 bullets
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Shoot 268 bullets
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Shoot 255 bullets
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Shoot 229 bullets
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Shoot 223 bullets
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Shoot 106 bullets
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Shoot 94 bullets
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Shoot 1 bullet