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 415 bullets
Shoot 416 bullets
Shoot 401 bullets
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Shoot 344 bullets
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Shoot 428 bullets
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Shoot 272 bullets
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Shoot 260 bullets
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Shoot 244 bullets
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Shoot 226 bullets
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Shoot 211 bullets
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Shoot 195 bullets
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Shoot 179 bullets
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Shoot 194 bullets
Shoot 165 bullets
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Shoot 129 bullets
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Shoot 339 bullets
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Shoot 331 bullets
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Shoot 329 bullets
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Shoot 106 bullets
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Shoot 95 bullets
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Shoot 8 bullets
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Shoot 2 bullets
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Shoot 1 bullet