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
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Shoot 386 bullets
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Shoot 349 bullets
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Shoot 143 bullets
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Shoot 338 bullets
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Shoot 334 bullets
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Shoot 306 bullets
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Shoot 295 bullets
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Shoot 284 bullets
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Shoot 279 bullets
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Shoot 274 bullets
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Shoot 272 bullets
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Shoot 268 bullets
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Shoot 238 bullets
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Shoot 126 bullets
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Shoot 116 bullets
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Shoot 105 bullets
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Shoot 47 bullets
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Shoot 1 bullet