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 421 bullets
Shoot 422 bullets
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Shoot 373 bullets
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Shoot 289 bullets
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Shoot 278 bullets
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Shoot 267 bullets
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Shoot 258 bullets
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Shoot 228 bullets
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Shoot 216 bullets
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Shoot 194 bullets
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Shoot 118 bullets
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Shoot 113 bullets
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Shoot 109 bullets
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Shoot 97 bullets
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Shoot 92 bullets
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Shoot 2 bullets
Shoot 1 bullet