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 427 bullets
Shoot 428 bullets
Shoot 422 bullets
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Shoot 367 bullets
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Shoot 349 bullets
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Shoot 295 bullets
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Shoot 288 bullets
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Shoot 278 bullets
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Shoot 277 bullets
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Shoot 194 bullets
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Shoot 177 bullets
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Shoot 112 bullets
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Shoot 116 bullets
Shoot 109 bullets
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Shoot 111 bullets
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Shoot 99 bullets
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Shoot 1 bullet