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 215 bullets
Shoot 216 bullets
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Shoot 129 bullets
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Shoot 131 bullets
Shoot 428 bullets
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Shoot 411 bullets
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Shoot 397 bullets
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Shoot 377 bullets
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Shoot 348 bullets
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Shoot 327 bullets
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Shoot 126 bullets
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Shoot 109 bullets
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Shoot 95 bullets
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Shoot 1 bullet