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 422 bullets
Shoot 423 bullets
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Shoot 373 bullets
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Shoot 364 bullets
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Shoot 341 bullets
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Shoot 336 bullets
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Shoot 294 bullets
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Shoot 284 bullets
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Shoot 276 bullets
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Shoot 270 bullets
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Shoot 266 bullets
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Shoot 239 bullets
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Shoot 175 bullets
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Shoot 166 bullets
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Shoot 127 bullets
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Shoot 106 bullets
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Shoot 2 bullets
Shoot 1 bullet