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 377 bullets
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Shoot 345 bullets
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Shoot 344 bullets
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Shoot 284 bullets
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Shoot 278 bullets
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Shoot 274 bullets
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Shoot 263 bullets
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Shoot 237 bullets
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Shoot 175 bullets
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Shoot 125 bullets
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Shoot 117 bullets
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Shoot 105 bullets
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Shoot 1 bullet
Shoot 2 bullets